Our canvas snap extenders will secure your shrunken marine canvas on boats, pontoons, RV’s and pop-up campers. Snap-X-Tendz™ are self-adjusting to provide tension between snaps and made with UV rated-saltwater tested elastic polymers and stainless steel snaps. Each piece will stretch up to 1.75″ and provide constant tension while providing a temporary solution instead of repairing or replacing your canvas. 3 color choices available in Tan, Black or Blue to match your canvas. Each package contains 4 pieces and you can connect two pieces together to double the length.