These are solid washers. The difference between the OD and ID is 16g equivalent (0.063''). The thickness of the washer is 0.032'';.
Made with Alloy 430 stainless steel. This alloy will rust if left wet. The rust can be rubbed off with a cloth.
These washers are slightly dished. They are also shipped with the residual cutting lube on them - so the package will appear dirty. You can clean this off by wipping them with a cloth, tumbling or by washing in hot soapy water and drying immediately.