Standard Stretcher Bars1
Fredrix Standard Stretcher Bars.
"Fredrix Standard Stretcher Strips feature tongue-and-groove design, each stretcher strip measures 1 5/8″ × 11/16″ with a full 1/8″ tapered lip for maximum clearance. They are molded on modern woodworking machines to ensure a smooth and tight fit."
Jack Richeson Light-duty bars.
"Light-duty bars are ideal for small paintings and can fit within the rabbets of most decorative picture frames."