DSG Canusa DERAY ECONBOX Heat Shrink Tubing Roll 3:1 - DSG-Canusa 8620120956, This DERAY ECONBOX heat shrink tubing from DSG Canusa has a shrink ratio of 3:1 and is supplied on a roll in a practical dispenser. Ideal for use in workshops and any premises where heat shrink is required on a regular basis. DSG Canusa 8620120956 DERAY ECONBOX 2.5m Heat Shrink Tubing Roll 3:1 12mm