Prevent the bending, warping, and twisting that results from humidity or dryness with BEST’s unique museum-quality Pro-Bar System. Stable and strong, it’s designed so that the canvas is always a full half-inch from the stretcher bars to avoid ghosting on the canvas. The combination of wood and recycled aluminum also creates a stronger, more rigid support for painting on a large scale.
Only kiln-dried pine is used to make Pro-Bar stretcher bars, which is attached to a specially milled 3/32” aluminum bar. The pine bar offers a smooth, rounded edge and solid surface for stapling or tacking. Bars measure 1-1/2” thick x 1-7/8” wide. BEST Cross Braces are recommended for frames larger than 60”.
BEST Pro-Bar Aluminum Corners are required to complete the system. Use four corners per frame, or eight corners for optimum strength. As an additional option for quick, easy canvas adjustment, use BEST Corner Keys.
http://www.dickblick.com/products/best-pro-bar-system/
