My wife and I had a Mr-S-Leather Rough Rider 2″ Extender, which we enjoyed, but it was PVC, so it had an off-putting chemical smell, and was ultimately too hard and unyielding. Silicone is a much better material, more expensive but well worth it. It’s odorless, tasteless, neutral and non-reactive. You can sterilize silicone toys by boiling them, and with proper care they should last a lifetime. Colossus uses a particularly soft silicone, very squishy and flexible.