Material- All collars are made from a biothane beta material that looks and feels like leather. Like leather, this material is tough, durable, and soft. However, unlike leather it is already flexible and does not need to be broken in. It will not fade, is easy to clean, and does not hold odor! The buckles are made of high quality and heavy duty zinc alloy. They feature a tactical quick snap and release feature. Buckles come in a larger size to fit the 1 inch collars and a smaller size that fits the 3/4 inch collars making sure that dogs of all sizes are comfortable.