eet Piper Doll Brand, a subsidiary of Doll-Forever. Piper Doll is a highly regarded manufacturer of silicone dolls without detachable heads. The tight fit of the body and head gives these Sex Dolls a very realistic look. They are made of modern Platinum TPE material, crafted to the smallest detail. Piper Dolls have also developed their own unique metal skeleton, which makes their movements extremely natural.