Great product. I do a lot of automotive wiring repairs. I always solder my connections and use heat shrink. the "hot glue" that lines the inside of this product helps prevent corrosion from moisture and the shrink ratio is great. the only thing I wish that I could buy is a assortment of the smaller sizes. most of this assortment is way bigger than I can use for my needs. as far as the product it's self 5 Stars all the way around!