I have these copper BBs and some silver zinc BBs from VOLV Precision. This review is about copper plates. Silver galvanized worse. Also, I always give a star if the product description is misleading. Here's the thing. The product description not only lists the plastic canister, it even has a picture showing the height of the canister. But there is no canister. And the BBs are small. I measured five. Their diameters (in mm): 4.36, 4.37, 4.36, 4.37 and 4.38. Average 4,368. The standard deviation is 0.007. There are the best BBs at the best price.