... . Material: iron,brass,alloy 2. Stone Colors: many colors available 3. Plating: light pewter, nickel free,lead free, non-tox 1. Material ... ,brass,alloy2. Stone Colors: many colors available3. Plating colors: nickel, light pewter, black nickel, nickel free,lead free, non-toxin etc ... time: a whole production line for crystal rivets,fast time, 3~7 days for5000000 sets. crystal rivets