Device	Keeper	High-end Notch
Anpen	Cable	U
Brasovia Lightweight	Cable	U
Climb Axe Max	Cable	U
Climb X, Version A	Cable	U
Clog Flyer, Version A	Rod	V
Clog Flyer, Version B	Rod	V

Device	Keeper	High-end Notch
Ellis Brigham Climb	Rod	V
GrandWall	Cable	U
I Climb (元鴻興有限公司) #652	Cable	U
Kailas	Cable	U
Kong Chuy #940	Cable	U
Mad Rock Max Air	Cable	U

Device	Keeper	High-end Notch
Ocùn Tuber, Version A	Cable	U
Ocùn Tuber, Version B	Cable	U
Rock Empire Guard	Cable	U
Unknown	Rod	V
Simond Tubik	Cable	U

Each of these is 55±1 mm. long and 47±1 mm. wide, and has a weight in the 54±3 g. range. Their slots are all 35±1 mm. long and 16 mm. wide. The main differences are that most have cable keepers and U-shaped notches on both ends, but some have rod keepers and V-shaped notches on the high end.

These have several distinctive features, but overall, perform like most devices of this type. The rope slots are hour-glass shaped, but this does not appear to affect their performance. They are slightly asymmetrical with a high and a low end, 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.

Most of these have shallow U-notches at both ends. The Clog Flyer, Ellis Brigham Climb and Unknown have V-notches at the high end, so I call these notched belay tubes. The V-notches are not as tall and acute as those on the Trango Jaws and its equivalents, so they do not provide as much braking. The U-notches on the others are are too shallow to noticeably amplify braking.

I prefer the ones with the rigid rod keeper. For the others, the plastic-coated cable keeper is moderately flexible, but stiff enough that it tends to stay out from under the rope.