The extra smooth, silky feel of silicone only adds to the immeasurably pleasurable shape of the Cadence, and thanks to the temperature sensitivity of this premium material, the Cadence can be warmed or cooled before play. Silicone is amazingly hygienic as well as immensely sturdy, with proper care it'll last a very long time indeed. A sterile, one-time use medical grade water based formula is recommended in terms of lubricant, and on that note be sure to follow sterile procedures during cleansing and use for your safety and comfort. Requires L1154 cell batteries, which are included.