Delrin is another material that we use in our shop to make goose calls. We machine and process it the same way we do our acrylic calls. Delrin is softer and denser than acrylic so it provides a nice rich mellow tone. It is also tough as nails! It is a great bang for the buck. We only offer it in black right now but we are adding more colors soon. The HEADHUNTER comes stock with our Skull Crusher broke-in guts.