Set of 2 stretcher bars 20 wide by Epic Art Group are made from solid pine wood. Consistent quality and kiln dried lumber assures you that the bars will fit nicely together and will be straight. These are perfect for small to medium paintings up to 40 on the longest side. Sold as a pair make sure you purchase 2 sets if you are making a square art piece or match them up with another size for a rectangle. Available sizes are: 12 16 18 20 24 26 30 34 36 40 and are sold separately. Also look for our plastic wedges (sold separately) for a complete professional assembly and a taut art piece.