Our Goose Call inserts are made from PolyCarbonate, which is a hard bulletproof plastic material. These inserts are pressed into a handcrafted body, allowing for them to last for years to come. The gut system in our goose calls makes for easy air pressure changes in an instant. By turning and pushing the guts in slowly or pulling them out, you can make your call harder or easier to blow depending on your air pressure. Prior to leaving the shop, RCC will tune every call to your personal liking, giving the user the best option to create an easy, authentic sound.