The aluminium low friction ring for tree care work - tree felling, removal of branches, redirection, etc.
The range of friction rings allows different techniques than those used with a rigging pulley. The small ring is mostly used for redirects, the large one mostly for the main anchor. The medium ring is adapted to both uses.
| FR1 | FR2 | FR3 | |
| Internal diameter | 20 mm (0.79 in) | 28 mm (1.10 in) | 38 mm (1.50 in) |
| External diameter | 50 mm (2.00 in) | 70 mm (2.76 in) | 99 mm (3.90 in) |
| Groove U-shape | 14 mm (0.55 in) | 20 mm (0.79 in) | 28 mm (1.10 in) |
| Weight | 50 g (1.76 oz) | 136 g (4.80 oz) | 395 g (13.93 oz) |
 MBS | 65 kN | 135 kN | 240 kN |
| WLL | 13 kN | 27 kN | 48 kN |
 MBS | 175 kN | 260 kN | 475 kN |
| WLL | 35 kN | 52 kN | 95 kN |
Friction is a major advantage, since it reduces the effort on the components of the rigging system that is used. It is easy to see in the use as main anchor. For the ground crew, slowing down loads is made simpler. Friction also gives the climber great comfort, since there is less strain on the upper anchor of the system. It is a valuable asset to improve comfort and thus safety.
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