"feature:1. There is no problem of wheel hole spacing, and it can be easily installed by selecting the appropriate size.2, not easy to wear, flexible rotation, quiet, durable, load-bearing.3. Made of high quality rubber and metal, durable, low noise and longer service life.4. Suitable for suitcases, roller skates, caster boards, scooters, etc. Quiet operation, anti-wear, shock-absorbing.5. 6 sizes are available. Please check wheel size, bearing size and axle size before placing an order.Notice:Actual colors may differ slightly from images due to different monitors and lighting effects.Due to manual measurement, please allow 1-3 cm deviation.describe:Material: Rubber + MetalColor/Style: As showninclude:1 pair of runner replacement1 set of tools(excluding luggage)"