- Prym black polypropylene strap. 50 mm wide. designed for sewing and craft projects - Perfect for making or repairing backpacks. bags. and belts thanks to its strength and sturdiness - 100% polypropylene material. lightweight and durable. ideal for accessories that require high resistance - Easy to cut and sew. adapts to different needs in haberdashery and belt making - Provides safety and firmness for daily use. maintaining the shape and functionality of accessories