Eyebrow piercing w/1.6mm x 10mm titanium curved bar. I usually pierced eyebrows with 1.6mm, by 10 or 12mm either a curved or straight bar; your choice. I can and have pierced with 1.2mm but in those cases I will pierce with a much longer bar 1.2mm x 12/14mm due to the fact 1.2mm jewellery is obviously smaller and as such, smaller balls run a greater/easier risk of getting embedded if there is persistent swelling.