About The Product: I. Material of the hey chain is high quality Zinc alloy and is made to last 2. The key chains both include their separate chain and key ring. B. Measurement of the key chains piece is 3.8cm 0.3cm ring inner diameter is 2.5cm. and the total length including the ring and chain is 9.5cm 4. it is very useful and unique design will give you n ore convenience. 5. Heychains for all you GTR lovers!