This urethral dilator set comprises of 13 dilators in one-millimeter increments, varying from 3mm to 15mm. The set is designed of long-lasting brass and appears in a delightful zippered carrying case for convenience and purity. The Rosebud Urethral Sounds Kit is a matchless collection of sensual urethral sounds. They are designed like rosebuds, so they have a special tip made for more intense stimulation. The rosebud tips are gentle but intense so you will love to experience them! Each of these sounds is about 12 inches long, but their thickness differs. The smallest one starts at 3 mm while the biggest ones are 15 mm.