Our thumbscrews are crafted out of 7075 aluminum on our CNC macines, then polished, and anodized to ensure a beautiful finish. our stickers on the thumbscrews are made from a Clear, flexible, polyurethane doming material that is designed to dent and rebound instead of scratching. it also has been laboratory tested to withstand 3 years of direct sunlight without yellowing as well as the ability to handle harsh cleaning chemicals such as alcohol and maticide.