This 50-piece heat shrink tubing kit features multi-coloured sleeving in pre-cut 4-inch (101.6 mm) lengths. The set covers internal diameters from 3/32 inch (2.38 mm) to 1/4 inch (6.35 mm), allowing colour-coded insulation across various wire gauges, solder splices, and component terminals.

When heated, the polyolefin tubing contracts to form a secure, non-conductive layer over bare wire connections and provides strain relief. The colour variety aids in circuit tracing and identification during recapping and rewiring projects on 1930s–1950s tube radios, gramophones, and automatic record changers manufactured by companies such as Philco, Zenith, RCA Victor, Garrard, and Voice of Music (V-M).