The smallest plug is quite small, nice easy insertion to start with. The next size up is much the same size as your average penis. Getting largest into a well lubed hole will challenge an intermediate plug user for sure! But once buried it is great! Awesome stretch for the entire length. And, as others have stated, the suction base allows you to give yourself a good fucking in the shower, wall, table, etc. Anyone looking to expand their anal play (and hole), great value for the price.