Press fasteners with a heavy fastening strength, such as the Prym sports and camping version, have a strong holding force and are particularly suitable for heavier fabrics on larger tents, tarps, covers, backpacks, bags or clothing. The sport and camping fasteners are available in the sizes 13mm and 15mm. For lighter applications, the fasteners from the categories medium or light fastening strenght are more suitable. All Prym-fasteners can be easily processed with the enclosed tool and a hammer. It is even easier with the Vario pliers, which are a real recommendation for more frequent use.