If potato chips can have ridges, why not butt plugs?
A quality plug with interesting features and vibrations - stays in place during intercourse. The ridges are a nice change from smooth plugs.
The most helpful critical review
Ribs on a butt plug? Really?
It's my understanding that I'm one of the few who dislikes this toy. I find the ribs uncomfortable. I rarely enjoy inserting or removing it. It often chafes. The bullet died quickly, but that was my fault, I think. But many other people I've spoken to enjoyed it.
Zing is a comfortable wireless silicone butt plug with a variable speed vibe that is set back into the silicone plug to avoid unwanted speed changes. The ridges on the plug add extra stimulation on the walls of the rectum. Vibe is removable for cleaning the plug. Made of 100% medical grade quality silicone, the Zing butt plug is flexible, hypoallergenic and warms to the body. Toy is boilable, bleachable in a 10% solution and dishwasher safe. Requires 3 LR44 batteries (included).
Do not use silicone lubricants on silicone toys. Use water-based lubes only.