Titanium (ASTM F136) threadless “snap-together” disk end. Great for nostril, earlobe, and ear cartilage piercings. Fits 18g or 16g or 14g threadless posts/barbells. By Neometal Sizing Guidelines: 1.5mm: super small end best for subtle nostril piercings. (DO NOT use with 16g or 14g posts) 2mm: average nostril size, smaller ear piercings. (DO NOT use with 16g or 14g posts) 2.5mm: larger nostril, average tragus, medium size for other ear piercings. Remember that these are just guidelines, and that your preferences may vary. Sold individually. You'll need a compatible post for a complete piece: Titanium 18g flat-back with 2.5mm disk Titanium 18g flat-back with 4mm disk Titanium 16g flat-back with 4mm disk Titanium 14g flat-back with 4mm disk Titanium threadless barbell post w/ fixed ball, 18g Titanium threadless barbell post w/ fixed ball, 16g Titanium threadless industrial post, 18g Titanium threadless industrial post, 16g Titanium threadless barbell post, 14g Titanium threadless barbell post, 12g