"A Baby Who Rocks Bes a Toddler Who Rides! Safely Gets Baby on a Bike, Even Before Walking! Fun to Ride. Easy to Attach to Any 12"" Strider Bike. Can't wait for the little one to begin striding with his/her new Strider bike? No problem. Start your baby rocking on this fun, low-to-the ground, indoor Rocking Base. This accessory easily attaches to and transforms your child's Strider bike into the perfect rocking horse bike! Baby-Riders Up! No batteries needed; no annoying sounds. Contains Base Only. 12"" Strider Bike Sold Separately Easy Assembly. Tool Included. All-Weather, Durable Plastic Construction. Rubber Floor Protection Strips. Gender: unisex."