Cocoknits' neutral-coloured foam stoppers slide all the way onto your needles (not just on the tip) to secure your stitches.
They are also handy for slipping onto interchangeable needle cords to keep your stitches from sliding off while you try on your top-down garment or use your needles elsewhere.
This selection comes with four each of six sizes to accommodate needle sizes 2-10mm / US 0-15.