Our Fluro Straight Barbells are made from the same high quality 316LVM grade of Surgical Steel as our standard barbells, except that we have replaced the Surgical Steel balls with acrylic balls, and these are not the cheap pop on balls, both the shaft and the balls are threaded. Barbells are the perfect choice for tongue, nipple, and male genital piercings. Bar measurements are taken from between both balls. The acrylic balls come in a wide variety of colors, including clear, but the clear is not nearly as good as our No-C-Um's, or Retainer's for concealing a tongue piercing.