Size: 14g(1.6mm), 12g(2mm), 10g(2.5mm), 8g(3mm), 6g(4mm), 4g(5mm), 2g(6mm), 0g(8mm), 00g(10mm). 🌻Secure Rubber O-Ring Design - The unique rubber ring design prevents your gauges from falling out, providing you with peace of mind while you show off your stylish ear gauges plugs.