Elastomer, Silagel and TPR (Thermo Plastic Rubber) are durable, hypo-allergenic soft plastics free from phthalates*. Use water-based lube and wash them with soap and water or toy cleaner. (*Phthalates (pronounced "thal-ates") are plastic softeners that are known to have carcinogenic properties. We do not recommend inserting them into the vagina or anus without a condom.)
I love that this toy is stretchy & can fit on lots of types of pump chambers, but I hated the cyberskin scent, & that it started melting only a few weeks after I bought it. Perhaps I got a defective one, idk. At least it made for comfortable pumping for a while.