These high quality stretcher bars are more than just a piece of wood! Their rounded back edge reduces surface friction and is designed to keep the canvas ½" from the stretcher bar. This feature helps insure that there will be no ghost impressions on the canvas. Stretcher bars are made from kiln-dried, knot free, straight white pine. Each strip measures 1½" high × 1¼" deep. Note — Price is per strip, not per pair. These stretchers are only for use with each other and Best Medium Duty Cross-Braces. They will not interlock with other brands.