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Designed not to slip in muddy caving environments. They hold well on iced and muddy ropes. Their simple durable construction make them an old standby for many rescuers. They can be rigged in all the standard methods for mechanical prusiks. The 3S has a spring-loaded design that holds cam in place on rope when not under load. Manufacturer recommended working load: 1000lb; Rope damage will occur approximately 3000lb; Ultimate breaking strength: 5200lb.