About this 3D model

Open heart book... The whole forms a nice keychain. You have 2 choices for the attachment of the chain: HANDBOOK-HEART-RING → Ring in the mass BOOK-HEART → To screw in hook from Ø 1.7mm to Ø 2 mm length to screw between 5 to 10mm. ( You can use a drill to recalibrate the hole to screw in a hook you have ) Good impression.