Do you have a lively energetic dog then this collar made of nylon with a patented durable aluminum clasp is perfect for your dog the alu strong clasp is light and easy to open and close so it is a very comfortable collar give it a try and see how durable the hunter vario basic alu strong dog collar is the hunter vario basic alu strong dog collar black at a glance nylon thick tight welded and sewn seam nickel plated metal fully adjustable simple and practical aluminum clasp colour