This is an official commemorative proof coin set from the 1988 Seoul Olympics. The 2,000 won coin is made of Pure Nickel, and the 1,000 won coin is composed of 75% Copper and 25% Nickel. The two pieces in the center of the top row are not coins but are made of plastic. Additionally, the 2,000 won weightlifting coin, second from the left in the bottom row, has a chip on the backside of the outer case. Please check the last photo for details. Sizes: From the top left of the top row (diameter, weight): 1: 3.7 cm, 20 g 2: 3.4 cm, 3 g 3: 3.7 cm, 3 g 4: 3.3 cm, 15 g From the left of the bottom row (diameter, weight): 1: 3.3 cm, 15 g 2: 3.2 cm, 21 g 3: 3.3 cm, 15 g 4: 3.6 cm, 20 g *All have a thickness of 0.6 cm. Case Size: Height: 21.2 cm Width: 12.0 cm Thickness: 2.8 cm Total weight: 365 g The item is carefully packaged and shipped with a tracking number. We use DHL for shipping services.