5669-100R QuickCable 1/2" x 100' Red Single Wall Heat Shrink Tubing (100' Roll) - This shrink tube has a shrink ration of 2 to 1, it is sealant free and has single walled construction making it very economical and great for your general purpose applications. This conforms to DOD Mil-I-23053/5 Class 1 and 2 and UL-224 125°C specifications.