Includes 2 Wheels with Abec 7 Bearings Diameter: 100mm Durometer: 88a Bearings: Precision Abec 7 These high-performance high-rebound scooter wheels were formulated specifically for street scooters. The 5-Star hub is designed to maintain strength & integrity of the wheel for riders who attempt extreme moves. Replacement wheels fit all 100mm type mini-scooters with and without suspension. Each bearing has shields to protect the bearing from dust and other contaminates. The bearings are manufactured to precise abec 7 standards.