Titanium (ASTM F136) threadless “snap-together” ball end. Great for nostril, earlobe, and ear cartilage piercings. Fits 18g, 16g, 14g threadless posts/barbells. Sizing Guidelines: 1.5mm (1/16"): super small end best for subtle nostril piercings. (DO NOT use with 16g or 14g posts) 2.5mm (3/32"): larger nostril, average tragus, medium size for other ear piercings (DO NOT use with 16g or 14g posts) 3mm (1/8"): best for lobe, conch, tragus, and helix/basic cartilage 4mm (5/32"): best for lobe, conch, tragus, and helix/basic cartilage 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