This is a single AndyMark Mecanum-style wheel, 4" in diameter, sold in an unassembled kit. The left and right-handed wheels use the same parts, and simply need to be assembled in different fashions in order to be made into the correct left and right wheels. This wheel is perfect for your FTC robot. If you're looking for an FRC drive train mecanum solution in a 4" form factor, check out the 4" HD Mecanum Left (am-3026L) and Right (am-3026R) Wheels. A set of four wheels is available as a kit found here, am-2626(Wheel Set). Replacement rollers can be found here: 4" Standard Mecanum Roller Kit, Single Axle (am-2539) Specifications:
Included Hardware:
Usage: This wheel is designed to directly mount to a Tetrix Wheel Hub. To use with Axle and Hub: