This pack of S-Biners from Nite Ize contains three S-shaped carabiners in different sizes. The smaller ones are light enough to be worn on clothing zippers, while the larger #4 can support up to 75 pounds of load. Each one is made from durable, weather-resistant stainless steel. The reinforced center bars can be used as anchoring points for valuable items for increased security. Their dual gates are spring-loaded for security and ease of use, and can be operated independently to allow you to clip items on without uncoupling the carabiner from its position.