P610957 Prym Chalk Cartridge. The chalk wheels “Mouse” and “Stick” and the parallel tracing wheel “Multi” can be refilled with this chalk cartridge. With the cartridge the chalk powder is replenished in white or yellow, also the entire top including the chalk wheel and cap are replaced. This way, the three marker aids are always fully functional and ready for use when they are needed at the workplace while sewing or dressmaking. The refill was awarded the Red Dot Design Award in 2010. 610957 YELLOW ERGONOMIC 1PC