Several types of canvas is available: single thread, double thread, Aida cloth (evenweave) or Hardanger.
Canvas is measured by the number of squares per inch or centimetre.
In Canvas work the stitches must completely cover the canvas.
For each type of canvas there is the correct type of yarn.
Yarns vary from knitting yarns and tapestry wools to pure silk or metallic threads. Fine ribbons, plastic thread, raffia and string can also be used in Canvas work.
A famous example of a large carpet worked in canvas work is the Bradford carpet which is on display in the Victoria and Albert Museum.
See: Needlepoint, Berlin wool work