New Callaway drivers were added to the USGA and R&A’s Conforming Club lists on Monday, making them legal for play this week at the PGA Tour’s Sentry Tournament of Champions and in other official rounds of golf.

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Callaway has not officially released the Epic Speed or the Epic Speed LS drivers, or announced when they would be made available to the public. However, based on the USGA photos published on its website, we can infer a few things about them.

The Epic Speed driver has an adjustable hosel mechanism, and behind four silver-toned dots positioned behind the leading edge, we can see the words, “Jailbreak AI Speed Frame.”

Jailbreak is a technology that Callaway has used in drivers for the past several seasons. It is a pair of bars that connect the club’s sole to the crown, directly behind the face, that helps to stiffen the chassis at the moment of impact and redirect energy that could be lost in the head’s deformation back into the ball for increased speed. Golfers could never see the bars, but they could see two dots on the sole that indicated where the bars were positioned.

Callaway has used artificial intelligence (AI) to design driver faces for three years. Harnessing the power of supercomputers to run thousands of simulations has helped engineers determine what shapes can help golfers achieve more distance. Perhaps artificial intelligence is now being used to help Jailbreak?

According to the notes that accompany the USGA’s photo, the words “FLASH FACE SS21” are found on the hitting area. Last season in the Mavrik drivers, Callaway used a Flash Face SS20 hitting area, so this is likely an upgraded version of that face.

A portion of the sole in the toe area appears to have a woven pattern, and while that could be cosmetic, that section could also be made from carbon fiber.

There is a single weight in the Epic Speed driver’s back, but the Epic Speed Version 2 and Epic Speed DS, which also now appear on the list, have a weight in the back and a weight in the front of the sole too. These weights could be moveable to shift the center of gravity (CG) location forward or backward.

It’s also worth noting that the Epic Speed Version 2 and Epic Speed DS have three small diamond shapes near the hosel that do not appear on the standard Epic Speed. They only have two Jailbreak dots on the sole, but both have the text, “Jailbreak AI Speed Frame.”

The Epic Speed LS driver also has a front and back weight, two dots near the words “Jailbreak AI Speed Frame” and three diamonds on the hosel. Under the diamonds, the letters LS have been added.

Many manufacturers have added LS to the names of drivers to indicate the club is a low-spin version, but Callaway has historically opted for the designation “Sub Zero” for low-spin clubs made for accomplished players.

As more details about the Callaway Epic Speed drivers become available, Golfweek will report on them.

Gear: Callaway Epic Speed, Epic Max, Epic Max LS drivers
Price: $529.99 with Project X Cypher, Project X HZRDUS Smoke IM 10 or Mitsubishi MMT shaft and Golf Pride Tour Velvet Align Black grip
Specs: Titanium chassis and face with moveable weight (Epic Max, Epic Max LS), carbon-fiber crown and sole panels, and adjustable hosel
Available: Feb. 18

Four years ago Callaway said it was able to advance the ball speed generated by its drivers with the addition of Jailbreak technology, a set of bars that linked the sole and the crown inside the head. Then the company made a significant investment in artificial intelligence and allowed supercomputers to design and test thousands of various driver faces to determine which would provide golfers with the most speed.

Now, for 2021, Callaway has applied the same artificial intelligence techniques that created the Flash faces to develop a new Jailbreak, and it is at the heart of the Callaway Epic Speed, Epic Max and Epic Max LS drivers.

The Jailbreak A.I. Speed Frame bonds the sole and crown of the club together, but instead of connecting in just two places, the supercomputer told Callaway to make it into a rectangular, frame-like structure that extends across much of the topline and the leading edge. It stiffens the titanium head both vertically and horizontally, and it can do a better job of taking energy that would have been lost in the head’s deformation at impact and redirecting it into the shot.

Callaway said the Jailbreak A.I. Speed Frame reduces crown deflection by 20 percent compared to previously designed drivers. As a result, golfers will get more distance, especially on shots hit toward the heel or toe.

The three Callaway Epic drivers for 2021 each feature the new A.I. Speed Frame as well as other key technologies, such as aerodynamic body shapes and lightweight carbon-fiber crowns that help lower the center of gravity. Each also has an adjustable hosel that allows golfers and fitters to increase or decrease the club’s stated loft by as many as 2 degrees.

However, even with all those similarities, there are significant differences between the three clubs.

Callaway Driver Models By Year

The Epic Speed driver has the smallest look in the address position, and while it has the same forward center of gravity as last season’s Mavrik driver, it has a higher moment of inertia and should be more forgiving. The Epic Speed also will produce a slightly higher launch angle than Mavrik.

Callaway Drivers

While the Epic Speed lacks the Mavrik’s sliding weight in the back of the head, Callaway gave the Epic Speed a slight draw bias by replacing the titanium with carbon fiber in the sole’s toe area.

Callaway Golf Shafts

The 460-cubic-centimer Epic Max is the highest launching and the most forgiving Epic driver because it has the highest moment of inertia. The Epic Max has a sliding 16-gram weight in the back of the head that allows players and fitters to create a large draw bias or encourage a fade. However, in any setting, the stability remains high because so much weight is concentrated in the back of the head.

Callaway Driver Dicks

While there is no low-spinning Sub Zero version of the Epic driver, the 460-cc Epic Max LS could appeal to accomplished golfers because its sliding 12-gram weight can create the most fade bias. However, it still has a high moment of inertia for enhanced forgiveness.