Features: Muscle Builder: Muscle building exercise tool for dogs providing countless hours of fun. Universal Design: Fit for medium to large dogs and the small one is intended for puppies. Bite Resistant: Made of stainless steel and cotton blend material durable and bite resistant. Easy Installation: You can hang spring pole from a tree branch or use a wood beam and hanger. Applicable Usage: Suitable for home garden backyard park pet care center and so on. Specifications: Spring Material: Stainless Steel Rope Material: Cotton Blend Color: 1: Silver 2: Black+Silver 3: Blue+Silver 4: Green+Silver  Types: 1: Without Rope 2: With Black Rope 3: With Blue Rope 4: With Green Rope Total Length: About 99 cm Fit For Dogs Of All Ages And Breeds Package Included: 1 pc* Spring Pole Or 1 pc* Spring Pole 1 pc* Rope Note: 1. Due to the light and screen difference the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.