Quick release of seat post makes it easy to adjust the height of the seat. EASY TO ASSEMBLE: 95% of the bike has been assembled, except the training wheels, handlebar, saddle and pedals. The packaging includes all necessary tools to finish the assembly. TWO HAND BRAKES: The combination of a front calliper brake and rear band brake gives more options for litter rider to learn to stop. PATENTED CRANK BEARING: Equipped with Royal Baby newly patented crank bearing which brings much higher transmission efficiency and lower rolling resistance. Easy to start, and extend the service life of the bike. WHY CHOOSE CHIPMUNK: Royal Baby newly developed Chipmunk branded kids bike offers factory direct sales for the best possible price. Our patented components feature designs specifically with the needs of children in mind. Great gift for 3-9 years old boys and girls.