12g is 3-1/4" long. 10g and 8g are 3-1/2" long. 6g and 4g are 4-1/4" long. 2g is 4-1/2" long. 0g is 5" long. 00g is 5-1/2" long. 7/16" is 6" long.
Because these are handmade, lengths may vary by up to 1/4".
All glass items, but especially those in smaller sizes, are extremely fragile and should be handled with care.