MarKnig is dedicated to the production and R&D of high perforce bicycles with exclusive components for the US market. We also pay great attention to the customers' feeling of use. There's always the one your child loves!Normal Kids Bike Specification Rims: 14/16/18/20 Inch Color: Blue/RedFrame: Carbon SteelBrake system: Linear PullShifter: Single Speed/7-Speed(20 Inch)Rider Height: 14 Inch for ages 3-5, height 37"-41".Rider Height: 16 Inch for ages 4-7, height 41"-53"Rider Height: 18 Inch for ages 5-9, height 43"-59"Rider Height: 20 Inch for ages 6-12, height 50"-61"(Note: Please take the kid's height into consideration.)Foldable Kids Bike Specification Rims: 14/16 Inch Color: Blue/PinkFrame: Carbon SteelBrake system: Linear Pull Shifter: Single SpeedRider Height: 14 Inch for ages 3-5, height 37"-41".Rider Height: 16 Inch for ages 4-7, height 41"-45"FEATURESThe foldable design makes it easy to carry and store.Ensures safety with a carbon steel frame, aluminum alloy rim, and natural rubber inner tube.Reliable front caliper brake!Removable flashing training wheels train the child's balance, making your child love riding!Convenient to adjust the height of the cushion, grow with your child!Compared with 85 percent of bicycles, our bike saves the trouble of installing some accessories.Quick-release seat for easy height adjustment, grow with your child!NoticeViolent transportation may also lead to damage to the product, please confirm whether intact before receiving the package, if the package was damaged please send the pics to our customer service team, and we'll apply for a full refund or a brand new one replacement.