The top one in the picture came out after the lower. I have the bottom one in the small. They come in different sizes. The one I have about 1.7 inch wide at the thickest part. The large is over 2 inches I think. It is soft silicone and feels pleasant and comfortable compared to a stainless one called thu hole plugs.
The one I have definitely gives me the Full" feeling. I can't imagine what the larger one would feel like much less being able to get it in. Being of soft material, it does take some learning experience to get it in the first few times.
Not sure of the intent on these types of plugs. I got them to avoid digestive irritations. The descriptions give some hint of being able to put something in the rectum (water to clean or lube ?)
The necks are wider on these type of open plugs, so it will stretch you a little.
The soft silicone will retain smells. I have a hard time getting rid of the odors. The stainless of course will not retain odors and easier to clean. They however are a little more pointed at the tip. If you like more info you can private message me.