These chalk cartridges are special because, in addition to precise line marking, can also carry out exact point marking. Use on a wide range of surfaces: textiles, wood, paper and plastic. Use for hobbies, sewing, quilting, 91489 building an 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. Sixteen white chalk cartridges. Includes chalk holder and sharpener.