The Petzl GriGri is an active assisted braking device that has long been the gold-standard for this genre, seen at crags and gyms all over the world. In
The New Gri Gri+ Review
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The Petzl GriGri+ is more durable and has more safety features - Alpinist
Petzl GriGri +
Grigri - Wikipedia
Safety in climbing demands the best belay devices – Daily Press
Designed specifically for the experienced belayer. An assisted belay device for the crag and gym that doesn't jam or and allows for a slick feeding of
Petzl GRIGRI BELAY DEVICE
Review: Mammut Smart Alpine and Petzl GRIGRI + (belay devices) - The Climbing Zine
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UKC Gear - REVIEW: Sneak Preview - Petzl GRIGRI+