100% Silk, 12-ply skeins. Silk ‘n Colors initially separates into 3 groups of 4-ply. Before stitching separate and put together the desired number of ply. Cross-stitching: we recommend 1-ply on 30 count or finer, 2-ply on 28 count linen, 4-ply on 18 count. Needlepoint: we recommend 4-ply on 18 count canvas and 6 to 8 ply on 12 to 13 count canvas.