Captive bead ring, circular barbell in 14 - 12 gauge and 3/8" - 1/2" inside diameter. Inside diameter should be at least 1/16" wider than the measurement from the tip of the hood to the location of the piercing. Barbells and curved barbells in 16 - 14 gauge and 3/8" - 1/2" long. The length should allow the bottom ball to adequately protrude from the hood. Wearing a barbell will eliminate twisting of the jewelry against tight clothing. Thicker gauges might be more comfortable, less likely to pinch or tear after healing.
6 - 8 wks