This is a key chain with key storage. It has several parts. You have make all parts separately then assemble it. It has magnets to make it close. You can anything inside as you want. 3d printable stl file format attached. Use hard filaments for 3d printing.

Keychain dimension is L X W X H 74mmX43mmX32mm.

Custom size and design possible. You have to contact with me for more details.

Thanks,Mahbub