If you've ever accidentally crushed your project bag and heard a snap, then you know the heartache of breaking a pair of needles. These little aluminum tubes are the answer - they measure about 6 inches long and have a rubber cap with a slit on one end - simply push the tips of your circular needles into the slit and they'll be protected from any bumps or bruises. They're also useful for protecting you from super pointy metal needles sticking out of your bag. And they have the added bonus of acting like stoppers, to keep your knitting from falling off the end of your needles.