•  Your individual anatomy - everyones ears are different so the diameter you need will be based on your skin thickness and ear shape. Unfortunately body jewellery isn't universal, so what works for one person may not necessarily work for you.
• Your piercing placement - generally a rook piercing is made around 5mm above the flat part of the rook cartilage, however some piercers may make it slighter higher or lower depending on your anatomy, so this can be the biggest factor to take into consideration when finding the perfect bar length or inner diameter for your individual piercing.

Gauge	16g (1.2mm)
Bar Length	6mm - 8mm
Inner Diameter	6mm - 8mm

Hoops:

Generally rook hoops range from 5mm to 8mm. Those with a rook pierced higher up may require a larger hoop. In our experience, 6mm tends to be a good starting point if you want the hoop to be comfortable but snug. Our Seamless Hinged Clickers are available in standard 16 gauge and 18 gauge thickness with inner diameters of 5mm, 6mm and 8mm. If you're a sparkle lover, our Angel Pavé Eternity Clicker is available in 6mm and 8mm.

Bars:

Rook piercings require a curved barbell due to the way they are pierced. The barbell length you need will depend on your skin thickness. The lengths usually range from 6mm to 8mm. For a short and snug fit, we recommend a 6mm length, if you have thicker cartilage or prefer a bit more room between the ends of the barbell, 8mm may be better suited to you.
Our Plain Curved Barbell and Crystal Curved Barbell are best-sellers for a rook piercing!

It's usually a process of trial and error to find your perfect fit, however we always recommend visiting your local piercing studio as they will be able to measure your ear and offer professional advice.