The Violet Flower Gem Plug Set by Booty Sparks is a 3 piece set of graduated anal plugs.  This set is great for training the anal sphincter, even beginners can start off with this set.  The plugs are made of aluminum alloy and ABS plastic.  They are 1 inch, 1.3 inches, and 1.6 inches wide.  These plugs look pretty and make backdoor play time fun.  Use plenty of water based lubricant with a back and forth motion for best results.