The "Raskullz Training Wheelz!" in pink and white are designed to fit most 12-inch to 20-inch bikes, making them suitable for children ages 3 and up. Made from a combination of plastic and metal, these training wheels provide stability and support for new cyclists learning to ride. With a sport/activity focus on cycling, these training wheels are a practical and colorful accessory to help children develop their cycling skills in a fun and safe way. Made in the USA and China, these durable training wheels are sure to assist in building confidence and proficiency on two wheels.