... .Caster materials:Plastic2.Loading capacity: 15 to 40kg per caster3.Wheel diameters: 30, 40,50mm4.Matching with various fittings such as ... Americans, our turnover of 2011 is USD27,000,000. Our wheel diameter is from 15mm to 300mm, materials include rubber, TPR ... , American type, and the popular type. Casters are more than 50 series, 1000 types for customers’ choices and wide different usage ...