(what is an onacup?)

original: "Special SOFT Edition!
Created with a state-of-the-art super soft material, let the TENGA WHITE tenderly caress you.
Created with state-of-the-art super soft material and a newly developed linear tube to softly stimulate your cock with tender caresses. Let the softness of the tube fondle and grip your cock. You'll immediately feel the difference of the delicate caress. From your cock entering the tube all the way until the last squeeze, you'll enjoy every second of pleasure with the TENGA WHITE."
We say: You adjust how tight it shall be. Nice feature.

Onacups (also known as onanism hole) are ment for single-use and can only be used a few times (by cleaning them or simply wearing an extra-thin condom).