3 Size options: 1 INCH Wide- Neck Size 16"-23" ； 3/4 INCH Wide-Neck Size 14"-21" ； 5/8 INCH Wide- Neck Size 11"-16". Collar material: high quality soft nylon make sure your dogs stay comfortable. The metal D ring is chrome coated, shinny and tough. The black buckle is made of eco-friendly plastic. The collar does not stretch itself, so make sure leave 2 fingers between collar and dog neck. In order to complete the look, our store offer matching leash, sold separately. We are professional dog collar manufacture and also pet lover. This dog collar is perfect for walking and training your pets. Make of Nylon material, the dog collar is lightweight, which let you and your pets more comfortable and freedom. We believe, simple design contain endless love.