If you're just starting to experiment with anal toys, or looking to go bigger, the Colt Anal Trainer kit can help get you (and your butt!) where you want to be. 

This trio of classic PVC plugs starts off small and ends large, letting work your way up. Each is firm and easy to control with a big, safe wide base, while being pliable enough to position perfectly. Use a good water based lube with the Kit, and enjoy!