Petzl PIRANA Descender. D05 (Bright), D05 NOI (Black). From $35.95. The PIRANA descender offers multiple braking options and and can be installed on the rope without removing it from the harness. Designed for use with canyoning descent techniques, the PIRANA has three selectable braking positions to choose from before begining a descent as well as two supplementary braking spurs to allow friction variation during descent. Securely attatches to the harness during rope insertion helps to prevent loss. Can be combined with a carabiner with a cross section of 12mm to create a rigid carabiner/descender unit. Weight: 90g. Use with single ropes between 8mm -13mm.