Great quality Polyolefin Heat Shrink Tube Polyolefin Heat Shrink Tube – Top Quality Heat Shrink sleeve Polyolefin are excellent for insulation. Perfect for electrical, electronic, automotive, hobby, electrical insulation, wire bundling, color coding, mechanical protection, wire/cable joints and repairs etc. Good electrical, mechanical and chemical performance. Take a Heat Shrink Tube with diameter slightly larger than Cut it according to the required length. @. Use a heat source to heat up the tube for 10-20 seconds.