Kid's Children's Adjustable Speed Quad Roller Skates Shoes BlueProduct Features:1.Adjustable length with the maximum length is about 9 inches, and the minimum length is about 6.6 inches. Suitable for kids' shoes' size of 9,10,11,12,US Little Kid.2.The maximum weight-bearing is about 50 KG.3.Four different colors for choices, loved by boys and girls..