8 Piece Sounding Wands Urethra Play - Sound Wand SetSounds come in a variety of styles, and are used in slightly different ways: Below you will find some of the different styles and the use of each.1) Dittel sounds have a flat end and a rounded end.2) Hegar sounds have two rounded ends, are fairly short, and are mildly curved in shape.  THIS IS THAT SET..... 3) Pratt sounds are longer urethral dilators (double ended ones are usually almost a foot long) with rounded and slightly bent ends.4) Van Buren sounds have a very pronounced curve on one end, specifically for the purpose of reaching the bladder. 5) Henk sounds have a more pronounced curve at the ends, as well as a metal rib on each end. What you are getting:*8 pieces, each piece measures 200mm~8" in length* Each wand has a number on it to tell you the thickness.* 1 wand has 2 thickness - ie first wand is 3mm and 4mm thick on opposite ends.* 8 Wands with 16 total sizes.1) 3mm-4mm2) 5mm-6mm3) 7mm-8mm4) 9mm-10mm5) 11mm-12mm6) 13mm-14mm7) 15mm-16mm8) 17mm-18mm