These product assortments consist of heat-shrink insulating tubing from a single manufacturer and product series, differing in size and/or color. Packaged in kit form, they offer a convenient solution for acquiring a diverse range of products essential for maintenance, repair, or product development operations. Various product series exhibit distinct characteristics, including the maximum ratio of pre- and post-shrink diameters, mechanical rigidity after shrinking, and the presence of an inner adhesive layer.