1.Aluminium Alloy 2.Clip closure 3.The screws of this key holder clip can unscrewed by coin,so it is very simple to use. The smart key clip won't make a big rumble and won't shake. 4.The EDC key holder is made of quality aluminium material, which is lightweight and sturdy, so you can pin it anywhere. It fits about 5 keys or less (depend on key thickness). 5.Clip your keys or other things tightly and in order with the buffer rings. This key holder can protects you from being hurt by keys. 6.This kind of key organizer clip prevents your keys from making a noise, being missing, being broken, being scratched.