The Envy Hollow Core Wheels are 120mm in diameter and feature 26mm wide urethane, 2mm thicker than most standard wheels! This gives the wheel more contact with the ground, resulting in better grip, stability and cornering! The core width is still standard at 24mm, making them compatible with any setup that can run 120mm wheels! This would make as a great gift or present. But They do not come in a pair.