● Designed with a safe dual brake system: a hand brake and rear coaster brake ● Includes double-using methods: with training wheels or without training wheels● 2 removable training wheels consist of a triangular structure for stability● 21"-23"/22.5"-25"/ 24.5"-27" adjustable seat fits kids of different ages and ● Quick release lever helps you to adjust or fix the seat height● Our 95% pre-assembled bike with tools included is quick to assemble● The high carbon steel frame for great strength and sturdiness● The anti-slip and shock-absorbing rubber tires can be divided into rubber outer inner tube and rim tape ● Front reflector and rear reflector for excellent security● Non-slip pedals and ergonomic seat for effortless and cozy riding● Additional bell brings more fun