35% wool, 65% viscose, comes (1) in rolls with unfolded felt wrapped around a tube in widths of 450 or 900 mm and (2) in a 1800 mm wide version whereby the felt is folded in half and then “rolled” up on itself; conforms to DIN EN 71 (parts 2 and 3: toy safety), norm ISO 105 E04 (colour fastness to perspiration) and Oecotex Standard 100 (health safety)