Variable width V-grooves lined with jam cleat like ridges produce high friction braking action like never before! In High Friction Mode (tail of rope departing the V-Grooves) count on 30-40% greater fall stoppin' power for bolted sport climbs, skinny ropes or big partners. Flip it over into Low Friction Mode and experience smooth action for trad gear routes, light leaders and low angle rappelling. Thick walls, large rope bearing radii and bomber retaining cable will give you years of reliable use. Now with machined lighting holes to shave excess weight. Assorted colors. Use on 7.7-11 mm ropes.