Come and see our amazing products. The shell is environmental protection ABS plastic material. The nylon rope is lengthen and shorten freely. You can use one finger to control your pet's range of motion,to make sure your pet is safe,avoid lost or accident.This rope features a retractable design and braking system to give your pet the feeling of freedom Pls confirm with us about the packing info, stock color and exact production time before placing your order.