1)three kinds are availabe,a) TPU(outside) and Nylon(inside), it is the best one for dog and catb) PVC(out side) and terylene(inside)c) Rubber. This kind is especially used for horse as leading belt 2) Series of sizes are available and your size can be designed 3)Multi-color is available 4)OEM is acceptable 5) Pet collar is our New Year important Project.