These synthetic rubber point protectors from Clover are a great tool not only to protect the points of your knitting needles, but also to keep stitches from falling off the needles when you're not working on your project. This style is meant for circular needles and are especially suited for fans of magic loop to keep your needle tips together.
The point protectors come in two sizes - the green and blue ones are for US needle sizes 0 through 8 (2 mm through 5 mm), and the yellow and red ones are for sizes 8 through 15 (5 mm - 10 mm). Sold individually.