These acrylic bag base shapers eliminate bag sag. They give your bag that new firm look and also protect your liner. The lightweight 1/16" clear acrylic is very strong and has a slight flex to it It also weighs 1/2 the weight of the normal thickness base shaper. The normal thickness 1/8" clear acrylic is a few ounces and has less flex. Both base shapers are 10X stronger than glass. The 1/16" black plastic is unbreakable. It is lightweight and has as much flex as the 1/16" acrylic.