We suggest going with 16g 3/8" curved barbells for brow piercings. At Metal Illness we offer three different ball end sizes for brow piercings ranging from 2mm-4mm. Everyone's brows are different, and factors such as brow shape and the shape of your face all play into the placement of your piercing. If you would like less space between the barbell ends or want a snug fit, we suggest changing the barbell length to achieve your desired fit.