Specifications: Auxiliary wheels, provide stable supports. Easy installment, individually adjustable. Suitable for all bikes from 12-20 inch. Type: Auxiliary Wheels Quantity: 2Pcs Material: Plastic, Steel Features: Easy to Install, Adjustable, Durable, Children Bike Accessories Wheel Size: 11cm x 2.5cm/4.33" x 0.99" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x Auxiliary Wheels 2 x Support Legs 2 x Non-slip Screw Caps 2 x Screw Gaskets 2 x Bracket Gaskets 2 x Screws