About the Septum Piercing?

it isn't safe to get a piercing done with a retainer if it's plastic just to let you know..plastic harbors bacteria & if a fresh wound that's a no-no..everything else has been answered so i'll tell you about the length..when measuring cbr's or horseshoes they measure them in circumference (how big around)..like 7/16ths, 3/8ths, 1/2 etc