ISC Wales Red Back-up Device - Crd&poppr. The Popper Tow Cord has a break-away clip which assists in smooth descents and releases (pops off) in a panic situation. Specifications for ISC Red Back-up Device: Manufacturer: ISC Wales Color: Red Rope Diameter Range: 10.5 - 11 mm Finish: Anodized Package Contents: ISC Red Back-up Device The ISC Red Back-up Device is a quality addition to the ISC Wales lineup. For more great deals on Ropes by ISC Wales please browse our ISC Climb page.