These chalk cartridges are special because, in addition to precise line marking, they can also carry out exact point marking. Use on a wide range of surfaces: textiles, wood, paper and plastic. Use for hobbies, sewing, quilting, model building and more. Break-proof packed, easily changed thanks to the patented hold mechanism. Excellent fabric use, washes out without a trace, even after ironing. No wax, natural chalk. Includes sixteen white chalk cartridges, chalk holder and sharpener. Refills available.