set2: 1 x Resistor Board + 4 x Heat Shrink Tubing Made of good material, and durable to use. Supplied Internal Diameter: 3mm,4mm,5mm,6mm The item is mainly used for wire connection, joint protection welding, electronic device, protection and insulation treatment, metal protection surface, etc. This is the "resistor replacement box", a low cost alternative solution, you can set flexible and fast resistor between 1R and 9999999R, 1R step precision. For educational experiments, electronic engineering design or test clipping are great applications. Design based on the resistor series theorem. 1/2 watt tolerance +/- 1% SMD resistors. High quality FR4 fiberglass PCB. Specifications: Product name: Heat Shrink Tubing Heat Shrink Tubing size: 10x6x3cm Specification: Maximum operating voltage: 200V colour: green/black Material: PCB/PE Resistor Board size: 90 x 35 x 10mm Package Contents: 1 x Resistor Board 4 x Heat Shrink Tubing