These are 6 16” BEST heavy duty stretcher bars which are made from finger spliced pine. Finger splicing removes splinters and makes these stretcher bars very durable. They will last for several years with regular maintenance. Designed to have at least 1/2” of clearance between the stretcher bars and the canvas so that no ghost lines show up on the work. Can be used for several different canvas weight. A great choice for any artist, whether you are a professional or new to canvas art. Great for art instruction and classroom usage as well. Constructed with a concern for quality, this set of stretcher bars will exceed your expectations.