Below, you will find the sizes guide commonly used by professional drivers for piercings ear.
| Piercing | Length/diameter |
| Helix with bar | 6mm / 8mm |
| Helix with ring | 8mm / 10mm |
| Tragus with bar | 7mm / 8mm |
| Tragus ring | 6mm / 8mm |
| Conch with bar | 7mm / 8mm |
| Conch ring | 10mm / 12mm |
| Anti Helix with bar | 5mm/6mm |
| Anti Helix with ring | 6mm |
| Rook banana | 6mm / 8mm |
| Rook ring | 6mm |
| Daith ring | 8mm / 10mm |
| Labret / Medusa | 7mm / 8mm |
| Earlobe with bar | 6mm / 8mm |
| Earlobe ring | 8mm / 10mm / 12mm |
