There are a few hollow butt plugs out there. but none as stupid hot as PIG-HOLE...shaped so it fits your hole like it was custom fit...made from OXBALLS skin-flex platinum silicone--the only material that feels like skin. warms up to your body temp fast. has enough strength to keep your butt open.

Pure Platinum Cure Silicone

Lube safe: water-base. oil base. water/silicone hybrid. silicone lubes

Cleaning: detergent and hot water. dishwasher. or soak in bleach-water solution

Total Length: 4
Total Circumference: 9.5
Usable Length: 3
Smallest Usable Circumference: 5
Largest Usable Circumference: 6.3/4
Inside Diameter:1.1/4
Weight:  3.5 oz.