This set of 12 removable stitch markers are called Twitches - with a twitch of your finger they pop open and pinch shut with a snap. Perfect for those who like removable, lightweight locking markers, they are equally useful for both knitters and crocheters. These markers come in 12 different coated matte colors - Black, green, red, yellow, blue, and lilac. The lightbulb-shaped markers are made of spring steel. They have a sharp tip on them and work well as both removable markers and as pins to mark a special spot on your knitting, or to hold a group of stitch markers together. The markers will fit comfortably onto crochet hooks up to 6.0 mm (J) and knitting needles up to 6.0 mm (10 US).