18PCS (14G-00G): 14G (1.6mm), 12G (2mm), 10G (2.5mm), 8G (3mm), 6G (4mm), 4G (5mm), 2G (6mm), 0G (8mm), 00G (10mm) -2PCS of each size. Acrylic Ear Plug with O-Ring. Material: Acrylic. High Quality.