Prym's two stitch stoppers in two sizes prevent the stitch work from slipping when they are inserted onto the ends of the knitting pins to halt the work. The plastic caps’ wide rims reliably ensure that all stitches remain in their place. Prym offers these practical knitting utensils in plum blue for pin gauges from 2 mm to 3.5 mm and in dove grey for pin gauges from 4 mm to 7 mm.