From the manufacturer

INTRODUCING EPIC FLASH STAR DRIVERS

Incredibly Lightweight Star Package For Maximum Swing Speed and Ball Speed

Ultra-premium UST ATTAS Speed 30g/40g class shaft, ultra-lightweight 30g Golf Pride JL00 combines with a lighter crown and fixed hosel system to save 50 grams vs. the Epic Flash driver.

Flash Face Technology For Fast Ball Speed

Callaway engineers used Artificial Intelligence and Machine Learning to create a radically different face design that promotes fast ball speed throughout the face.

Jailbreak Technology For Fast Ball Speed Jailbreak Technology For Fast Ball Speed

Internal Jailbreak bars stiffen and stabilize the crown and sole, placing more impact load on the face to promote fast ball speed.

New T2C Triaxial Carbon Crown Material Lowers CG for Easy Launch

New T2C triaxial carbon fabric has a tighter weave to save weight, which is redistributed within the head to lower the CG to promote easier launch.

The Epic Flash Star driver is a remarkable achievement in distance-enhancement, with our renowned Flash Face and Jailbreak technologies in an ultra-lightweight design.
Callaway engineers used Artificial Intelligence and Machine Learning to create a radically different face design that promotes fast ball speed throughout the face.
Internal Jailbreak bars stiffen and stabilize the crown and sole, placing more impact load on the face to promote fast ball speed.
New T2C triaxial carbon fabric has a tighter weave to save weight, which is redistributed within the head to lower the CG to promote easier launch.
The incredibly lightweight Star package is designed for maximum swing speed and ball speed.