There have three type of earring studs,The longer one’s length is 11.5mm, the standard one is 10.5mm, and the shorter length is 9.2mm.
L23/L24 Series ,Long post for conch and thick lobe.Stud No with L,stud size 4mm ball.
S23/S24/S25/S26/S53/S54 Series,Short post for baby with hat nut,Stud No with S,stud size 2mm,3mm and 4mm,4 colors,
L23/S23/S25/S53 made of Surgical Stainless Steel 316F
L24/S24/S26/S54 made of 24K Gold Plate 316F.