From their website:

The AT line of GR Guitar is the lightest line of guitar cabinets in the world and the first in carbon fiber.

Designed to work best with all profiler systems and digital systems, these cabinets offer lightness, power, design, and a frequency response capable of reproducing the sounds for your instrument in the best possible way.

We have chosen the best components to offer the best sound solutions, all in an incredibly light product.

A 1 x 12″ Custom Dual Cone Jensen / Sica woofer and 300 Watt make this cabinet the perfect compromise between lightness, size, power, punchy and top quality.