Commonly inserted objects include butt plugs, anal beads, dildos, vibrators and fingers. Prostate massage equipment ranges from dildos to butt plugs and G-Spot vibrators. Triple-ended dildos provide both vaginal and anal stimulation of the female partner. This includes penetration of the anus by fingers, hands, or sex toys such as dildos. Abyss also sells silicone toys such as female torso products and dildos among other offerings. The following three sexual configurations can be performed with using double penetration dildos. High-end, chrome plated steel dildos are also popular in the BDSM scene. Several of the dildos offered for sale are modeled on the penises of Falcon's performers. Dildos were not just used for sexual pleasure. Silicone rubber dildos became popular in the 1990s. Initially expensive, the cost of silicone dildos has dropped over time. Later, PVC dildos with a softer PVC filler became popular. Rubber dildos, usually incorporating a steel spring for stiffness, became available in the 1940s. The Romans created double-ended dildos for use with a partner. Glass and steel dildos have similar features.