Considered to be one of the most erotically stimulating forms of play, the Master Series Mortal Coil Sound imaginative sound instrument is made of brushed stainless steel and is designed to increase pleasure. Progressive swells allow for added stimulation. Long and smooth, this sound is perfectly suitable for specific stimulation. Take it to the next level with a little temperature play...The Mortal Coil can be warmed by warm water or cooled in the refrigerator. Stainless Steel is: Non-porous, Hygienic, Easy to sterilize, Temperature resistant, Impact resistant, and has a long term value.