This sleeve is made from TPE. Usage & time will wear down the sleeve causing discoloration and disfiguration, as well as compromise the integrity of the sleeve. To make sure you get the most out of your product, make sure to get a replacement. Usage and time can wear down on your Robin sleeve. With the Robin sleeve replacement, you can bring that initial burst of pleasure back into your life and your Robin. Use it with your device or it its own, bring pleasure back your own way.