The inner hole of the Yomiko version has a set of varying sized nubs throughout the wall. The path is straight at the beginning and weave in a pattern towards the end. These complicated spirals and twists are usually found in more expensive, bigger sleeves.
The entrance is scaled with a realistic looking lip and a little hole as entrance. This gives it a tight fit and helps in lotion retention. Swap Cock Shooter is compact in size and is priced as such making it a great product for beginners.
*Use only water-based lotion or lube with this product.