Your dog doesn’t mess around when it comes to exploring, and neither should their gear. Made with durable rock climbing rope trusted by climbers and heavy-duty hardware - you’ll have the strongest collar out there. Made with tightly spun, polypropylene/polyester rope Heavy-duty plastic clip Nickel-plated, steel d-ring Small is a single flat rope, ~ ¾ in wide Medium & Large have 2 side-by-side flat ropes, 1 in wide