Erotic toys made of these materials are very popular due to their pleasantness to the touch and flexibility. They are not as good as silicones in terms of health safety, but they belong to the middle class in terms of quality. TPR or thermoplastic rubber and TPE as a thermoplastic elastomer are used extensively in artificial vaginas, penis sleeves and other similar devices that need to be adapted to size and shape. It is important to be hygienic with these devices as they have smaller pores in which dirt can remain.