This Secret Compartment Chrome Keychain Kit has a secret built in compartment. This gives you the opportunity to hide money, toothpicks, floss, reminder notes and more when you’re on the go. So you have access to these secrets wherever and whenever you need them. The Chrome plating is ultra hard, gives a superb substrate adhesion, has a bright, attractive finish, and is stable and noncorrodable. It also gives ultra high metal-to-metal sliding wear resistance and provides superb abrasion resistance, even under high contact stresses. Plus it gives a very low wear rate (at least 100 times better than hardened steel or electroless nickel).