We bought our first mold to make rubber net bags in 2006, in fact we bought three different molds for different size net bags. These net bags had rectangular holes and worked ok except that fish jaws would get stuck in the holes and in many cases break their jaws. They were also manufactured with a material that contained polyvinyl chloride (PVC) which is one of the most un-environmental plastics on the planet. Naturally hard it is made softer by adding plasticizers to the PV