Finding the perfect bike that grows with your child can be a challenge. 2-in-1 Kids Bike. Why choose our 2-in-1 Kids Bike?. Unit Quantity: 18.7 Material: Steel,Carbon Steel,Alloy Steel Features: Adjustable Seat,Bell,Kickstand,Quick Release Crank,Quick Release Seat,Balance and Pedal 2 in 1 Bike,Adjustable Handlebars,Tool Kit Bike Type: Balance Bike.