Features 1、More durable, using high quality environmental protection high strength PP plastic. 2、Our products have done static treatment, no scrubbing, maintain the bright and beautiful for a long time. 3、These heavy rear wheels provide the necessary safety and stability needed for the first road test of a bicycle, giving your child the best start for balance and confidence without holding the saddle. 4、This heavy-duty rear wheel stabilizer helps young students ride their bikes until they have a usable sense of balance. 5、Suitable type: suitable for most 12inch to 20 inch single‑speed bikes. With horizontal rear track fork ends, but not for half‑horizontal or vertical drop bikes. Condition: 100% Brand New Item Type: Children Bike Training Wheel Material: metal + rubber Color: blue, pink (optional) Suitable for: 12 "/ 14" / 16 "/ 18" / 20 " children bicycle Diameter: approx. 11.5cm/4.5inch Thickness: approx. 1.5cm/0.6inch Package List 2 x Training Wheel 2 x Support Bracket 1 x Screws Bag