Ready to take a dive into extreme anal exploration? The Hard Steel Anal Trainer Kit will help your body safety acclimate to major length and girth! Start small and work your way up to large. Hard Steel plugs are made of solid PVC. Each plus is tapered for comfortable insertion and is equipped with a neck to hold it in place and a firm base for anal safety. Lube them up and get ready to train! From Blush Novelties. Small butt plug length 4 inches, 3.6 inches insertable, girth 1.25 inches. Medium butt plug length 4.75 inches, 4.25 inches insertable, girth 1.5 inches. Large length 6.5 inches, 6 inches insertable, girth 1.75 inches.