When I bought a LEER cover for a used truck the supports were worn and the glass cover didn't stay on. I got a number from the old ones and the product description for the exact part number in this addon says 39 pounds for each shock, my old one said 40 pounds on it, I went ahead and ordered it and the new kit arrived the next day and on both 40 pounds are written. Not sure why the product description says 39lbs but rest assured they weigh 40lbs just like the original. The cover works perfectly, like new, exactly what I was looking for.