the caster with various colors and various materials high-quality steel and plastic material firm structure multi-purpose The features of caster: 1.Wheels' sizes: 1.5",2.5",3.0",4.0",5.0',6.0" . 2.Material:PA,PU,TPE,TPR,TPU and so on. We can offer any material you are requested. 3.Caster wheels' colors: black red yellow invory-white. 4.Packing:100pcs/carton.