Zinc Alloy Heart Slide Charms, Lead Free & Nickel Free, Platinum. Size: about 9mm long, 9mm wide, 6mm thick, hole: 6x1.5mm. Plain metal slide charms with a wide big hole. It is typically used for sliding. Any threads or wide cords would be available. And buy this 50 pcs Zinc Alloy Heart Slide Charms For $4.07 @PandaHall.