Multi Tunnel Ear Plug Piercing Mold. SIZE: 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm.(A-36) Multi Tunnel Ear Plug Piercing Mold. SIZE: 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm.(A-36) Made from clear silicone Clear so you can see where your inclusions are and move them to where you want them Flexible for easy casting removal Durable and reusable, made from high quality materials