Gauge: 6g(4mm), 4g(5mm), 2g(6mm), 0g(8mm), 00g(10mm), 1/2”(12mm), 9/16”(14mm), 5/8”(16mm), 11/16”(18mm), 3/4”(20mm), 7/8”(22mm). You will receive 11 pairs of silicone tunnels, a pair of each size. Material: made of thin silicone, a smooth surface has no roughness, flexible and soft. Comfortable for everyday wear, especially against the pillow at night. Color: Flexible to Operate: Easy to put in and out. Fold them in half then let them expand open in your ear and they stay. Easy to use: Just fold the ear tunnel in half then let it expand open in your ear and it will keep stable. No sharp edges, lightweight and easy to clean. Give you a wonderful piercing experience.