DoubleStar UMPB Push Button Sling Swivel and Cup Black. Specifications for DoubleStar UMPB Push Button Sling Swivel and Cup: Manufacturer: DoubleStar Color: Black Fabric/Material: 7075-T6 Aluminum Weight: 1.5 oz Finish: Anodized Included Accessories: Hardware Features of DoubleStar UMPB Push Button Sling Swivel and Cup Cup & Swivel Quick detach Package Contents: Doublestar UMPB Push Button Sling Swivel and Cup DoubleStar A202: UMPB Push Button Sling Swivel and Cup Black