This is a very soft silicone sleeve intended to provide a 75mm extension to a cock. Thee 'solid' end has in fact a 16mm diameter cavity in it which combines with the very soft silicone material from which the sleeve is made to make this very squashable. Our use for this was slightly non-standard as we wanted it to solve a problem we have in using a Feeldoe double dildo for pegging (female to male anal sex with a strap-on). We love this but like it best of all in face-to-face positions and for this we find the Feeldoe is rather too short. However, this sleeve makes a very snug fit over the shaft of the feeldoe and because both a made of silicone the grip between the feeldoe and the sleeve means we never have any problem with the sleeve staying put (though a small cock ring over the base of the sleeve would further increase its security if needed).
We found that the sleeve was, if anything, too soft and we filled the cavity in the end with a suitable size rigid plastic tube to make it firmer. The studs and ripples on the surface of the sleeve look intimidating but are so soft that they give a pleasant but not excessive increase in sensation. We think the texturing of the surface also helps hold lube and prolong comfortable use. The sleeve is quite thick walled and this slightly increases the girth of the dildo on which it is put. Of course the head of the main dildo is now some 3 inches back from the tip and this gives delightful prostate stimulation while the head of the sleeve is still providing a good feeling of fullness. Insertion is especially delightful. Overall this sleeve on the regular Feeldoe gives the best pegging experience I have ever had.