DRITZ-Chalk Cartridge Set. Remember the chalk holders our teachers used to use? Dritz has developed one for all of our at-home needs. The chalks are only 4mm thick and come in every color you could possibly need for sewing, quilting, crafting, scrapbooking, and much more! Featuring a 4-3/4x7/16in red/yellow plastic cartridge, a sharpener to keep your chalk line fine and a reusable plastic box with sixteen extra chalks: eight white, and eight assorted colors. Imported.