No matter what type the garden hose and sling shot is, They are mainly made of the raw materials we purchased from our qualified suppliers. The quality of incoming materials, therefore, is the most important factor on finished hose and sling shot effect. At my factory, With a professional team of touring staff, We ensure that all the materials we selected are qualified by the international laboratory. Besides, they are classified & inspected following our industry standards by our IQC department before being put into mass production.