You'll save time and money and eliminate waste with pre-cut clear-grain frame lumber without any knots or splinters. Make the exact frame size you need with this lightweight, kiln dried, pre-grooved, perfectly straight ponderosa pine lumber. Precut for easy handling and storage in size 1-5/8" square. Frame lumber is ready to assemble. Use with cord, staple or adhesive mesh stretching methods. Ideal for school projects. Use with Tite-Stretch Tool and Chord.