Advantages of Wunderbars
1. Wunderbars slot together square. Made from high quality tulip wood, all Wunderbars constant tension stretcher bars are machined so that the spring block just slots right into the bar, this makes the bars automatically square when you put them together.
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 | 2. No specialised equipment needed. Because of the way the spring blocks work there is no need for any expensive or professional equipment to stretch the canvas. All you need is a decent stapler and your hand. So no need for highly trained or experienced people to stretch the canvas either !! You just staple the canvas as you would do a normal canvas, but, this time only using your hands to pull the canvas. You don't need to pull hard, just enough so you can staple the canvas to the frame in position. When the pins are pulled the bars do all the stretching work for you. |
| 3. Automatically Stretches the Canvas Remove all 4 pins and your canvas is stretched. Simple as that. Theres no pliers, machinery or skill involved. If you include the frame squaring along with the stretching, it only takes a few minutes to stretch an entire canvas...giving those big bits of machinery a run for their money! Remember, anyone can stretch a canvas with Wunderbars stretcher bars. |  |
 | 4. The Canvas is ALWAYS under tension No matter where you hang it, in the heat or the cold the canvas will always maintain its tension because of the spring block inside. So there's no more hammering wedges or keys or returns to your customers for sagging canvas. Its just constant tension and a professional finish to your stretched artwork. |