Rev'it! Quantum 3 Elbow Slider Kit Replacement elbow sliders for the Rev'it! Quantum 3 Pro Jacket and Quantum 3 One Piece Race Suit. The high designation refers to the amount of material that is reserved for sliding, are recommended for those who plan to ride on a track. The low designation means these elbow sliders are much more integrated into the suit and more streamlined that their high designation siblings. Features: Made of TPU (Thermoplastic Urethane) Sizes: High - 11.5mm thick Low - 7.5mm thick Only with Quantum 3 Pro Jacket and Quantum 3 One Piece Race Suit Sold in pairs