A set of 6 18” BEST heavy duty stretcher bars constructed from high quality durable finger spliced pine. The finger splicing method makes the pine much stronger than other types of wood. These stretcher bars have 1/2 inch of clearance between the canvas and the bar to protect the canvas from ghost lines. Compatible with a wide range of different canvas weights. Can be used by new artists and professionals alike. Perfect for students and instructors and well. Rounded back allows canvases to be easily stretched to make snug canvases that are uniform. Free from knots and splinters, and superior in design and quality than most other stretcher bars.