Geekidoc physician designed, high-grade brass, black chrome plated EKG calipers will truly last your entire career. To help avoid these from becoming lost (or mistaken for someone else's cheap plastic version) Geeidoc has made these quality calipers bright yellow-green. We have also added a rubberized texture so these won't be slipping out of your talented hands. All details accounted for -- arms are adjustable if too loose or tight (tool included). Great carrying case that slips right into your white coat pocket. Tips are tough and hardened by steel so as not to break. Manufacturer money back guarantee!