For ropes with diameters between 9,1 and 10,5mm.

Weight: 260g.

Safe, for all your sport-climbing ropes, resistant, ergonomic, dynamic, light and easy to use!

Sum is a new generation belay device/descender designed to belay the first and the second in sport-climbing routes or climbing-walls:

You can give rope fast and easy without touching the lever. Its symmetry makes it as good for left-handers. Dynamic braking which gives good absorption for the first-ascender. It is very simple way to put in the rope.

It comes with a 'Belay Positioner' which assures that de carabineer always works in the correct position.

can also be used for Rescue, Zip-lines, Ascending and descending.