You will receive TWO PAIRS of tunnels in size of your choice. First pair of tunnels are single flare 316L surgical steel with o-ring & groove to keep in place. Lightweight & comfortable! Second pair are same as above except black titanium plated. Tunnels are 10mm length. 10g…2.4mm 8g….3mm 6g….4mm 4g….5mm 2g….6mm 0g….8mm 00g 10mm 7/16"11mm 1/2" 12mm 9/16"14mm 5/8"16mm 3/4"19mm 7/8" 22mm 1 inch 25mm 2 Pairs Single Flare Stainless Steel & Titanium Tunnels Gauges Ear Stretching Kit 10G 8G 6G 4G 2G 0G 00G 1/2 9/16 5/8 3/4 7/8 1 Inch