Maybe they'll help you see your knitting better when it's dark? Probably not. However will keep those stitches on your needles when you're not knitting!
Sold as a pair, these knitting needle stoppers fit best on sizes US2 (2 3/4mm) up to US13 (9mm).
Made with 100% FDA approved food grade silicone. They are heat resistant and dishwasher safe.