Hegar dilator Set consists of 8 dialotors made of stainless steel and comes in a leather case. Each Dilator has a smooth shaft for comfort whilst creating intense stimulation and pleasure. Made of body safe stainless steel. We recommend a good quality lubricant is used for easy insertion. Rounded tip for easy insertion.No porousHegar dilators provide the option of double ended dilators in even millimeter increments, or from 3 to 18 for a greater diameter range over the entire set3mm to 4mm5mm to 6mm7mm to 8mm9mm to 10mm11mm to 12mm12mm to 14mm15mm to 16mm17mm to 18mm