6g is 1-7/8" tall and 1-1/4" wide.
4g and 2g are 2-3/8" tall and 1-1/2" wide.
0g and 00g are 2-3/4" tall and 1-3/4" wide.
These are all hand made and matched the best they can be. Each piece will vary a bit as it's impossible to have two identical pieces.