I acquired my Ocùn Tuber from Expé-Spelemat in 2008.
The Ocùn Tuber is forged from aluminum alloy and then soft anodized. Mine is 56 mm. long, 47 mm. wide, 102 mm. high, and weighs 56 g. The slots are 35 mm. long and 16 mm. wide. The top of the Omega oval carabiner that I use for comparing belay tubes sits 13 mm. below the ends of the slots. The Ocùn Tuber has a flexible, plastic-covered, cable keeper.
One side of my Ocùn Tuber is marked with the Ocùn logo, while the other has "Ocùn®."
The Ocùn Tuber has several distinctive features, but overall, performs like most devices of this type. The rope slots are hour-glass shaped, but this does not appear to affect their performance. The Ocùn Tuber is slightly asymmetrical, giving two distinct riggings. One would expect a difference in friction for the two riggings, with more friction if the braking line runs over the shorter end; however, I do not notice much difference. The plastic-coated cable keeper is moderately flexible, but stiff enough that it tends to stay out from under the rope.
The Ocùn Tuber is essentially the same as the Climb Axe Max, Kong Chuy, Mad Rock Max Air, Ocùn Tuber, and Simond Tubik.