Singing Rock Dyneema 11mm Express 20cm. These 11mm Dyneema slings are strong and durable. Express slings are sewn to be used safely as quickdraw slings. All others are open slings. Assorted colors. Features of Singing Rock 11mm Dyneema? Slings: Strength: 22kN Width: 11mm CE and UIAA Certified Package Contents: Singing Rock 11mm Dyneema? Slings The Singing Rock 11mm Dyneema? Slings is a quality addition to the Singing Rock lineup. For more great deals on Runners & Slings by Singing Rock please browse our Singing Rock Climb page.