Peters Art Supplies Online Shop: Self-tensioning wooden stretchers
Self-tensioning Aluminium Stretchers have 2 frames: a stable inner aluminum armor and an outer frame made of wood, carrying the canvas. Between the two frames there are springs that connect the inner and outer frame. The springs balance the pressure on the outer frame and thus maintain the tension of the canvas. Due to this, if they are set in place correctly, these frames are very gentle on sensitive or historical paintings.