The Bell Sports Flip Up Training Wheels help you to teach your children how to ride a bike on their own. They have a flip-up design that allows you to disengage them without having to remove the units entirely, which makes is convenient if you have multiple children of different skill levels using the same bicycle. These Bell Sports training wheels are easy to install and they fit wheels between 12″ and 18″ in diameter so you can use them with kids of varying ages. Features: Wheels flip down when needed, flip up when not in use, Fits bikes with 12″ to 20″ wheels, Easy to install Brand: Bell Assembled Product Weight: 2.4 lb Manufacturer Part Number: 7072772 Color: Silver Manufacturer: Bell Sports Assembled Product Dimensions (L x W x H): 2.00 x 12.00 x 7.75 Inches