The Love Shake masturbator's material is soft yet elastic to give you a tight feeling. This "Function" version has an interior that is lined with ribs and parallel groove for a strong stimulation. This is a great economy product combining low price, good material and interior design. Due to the special method of making Love Shake Function, the surface is covered with tiny bubble like texture. This is intended and is not a defect of the material.
*Use only water-based lotion or lube with this product.