This is an original design from Kiwa Seisakusho. The size of the can is approximately 0.8 x 3 mm, the thickness is approximately 1.8 mm, and both sides are coated with Epo. There are 2 sizes, so we recommend mixing and matching different sizes. Please connect the parts using rings. It comes with 2 rings, so it can be used as a joint part by inserting it between chains and parts. There is also a charm with 1 ring.