This is a comfortable labret Monroe lip piercing jewelry with a Bio-Flex shaft with nickel free and a 14K gold with a prong set 2.5mm clear gem. The comfortable flat end measures 4mm. This is an easy to wear, just push the ball into the Bio Flex shaft without any twisting! The size is 16 gauge and length is 8mm-5/16 of an inch. The entire piece is nickel free.