At the same kind of material, folding umbrella is the easier it will be more bad than the automatic easy to open a bad hand. Umbrella of the number of bone can not directly identify the umbrella of good and bad. Umbrella depends on the bone material is what to do. Umbrella bone Can be divided into: steel frame 'steel' aluminum alloy bone 'bone fibers' bone resin. Most of parasols with ultra-light frame. Most of the materials used aluminum alloy bone 'bone fibers' bone resin. However, aluminum alloy bone 'bone fibers' bone resin prices higher. So often in the high-grade umbrella. Fabrics inside, silver plastic fabric is the best, silver-coated plastic thicker, the better. But the silver plastic umbrella with you once it refers to the sun-lower. A long time would look very bad . Touch fabrics from sun can, but not beautiful cloth. A lot of people do not like. So many of them made double, and three-Fold Umbrella. If half of the amount made, not too rough a folding