Mas Design, Premium grade 5 Titanium are used to create this unibody Key Carabiner. The C TYPE carabiners were created for the sole purpose of carrying keys and light weight accessories. The gate is optimized for easy opening and secure fastening of keys to your belt loops or purses. Using the same design template, I varied the designs of the different C TYPE to fit the design preferences and intended uses of the users. All carabiners will fit easily and comfortably on belt loops, but those with wider top section, can accommodate wider leather straps. The C TYPE are designed to be compact and easy to snap on to your belt loops.