Colored PVC heat shrink tubing is great for general-purpose applications. Flame retardant. Continuous cooperation temperature: -30 deg. C. (-22 deg. F.), Shrink temperature: 110 deg. C (230 deg. F.). Inside diameter before 1/4″, after 1/8″. Conductor gauge No. 20 – No. 12 AWG. 8′, blue.