Abstract: Casing for bar-shaped cosmetic products, such as lipstick bar container casings, obtained from a base of polyolefins, polycarbonates, styrenes, polyvinyl chlorides, polyacrylics, polyoxymethylenes, nylons, thermoplastic saturated polyesters, or polyphenylene oxide. The plastic product selected from any of those mentioned above is included in the casing mixed wit fibreglass, which improves the rigidity, dimensional stability, and mechanics of the various parts that maku up the casing.