PRYM Roller Powder Chalk Mouse Guides Comes with a secure cap that is safe and convenient for carrying and storage. You can set the guides in 0.6 inch (15 mm), 1.0 inch (25 mm), and (You can also remove the guide to use it) *Spare cartridge sold separately, includes a roller and cap at the tip. You can replace the rollers at the tip, so you can replace the white and yellow spare cartridges with one body.