... affusion mouthMetal screw mouth or plastic screw, such as copperVol / size300ml – 2000mlFeature1, First grade natural rubber hot water bottle,2, Resistant to boiling ... .3. The products after 100%pressure leak detection test.The hot water bag is made of by Natural Rubber material, also can ... warm. It is durable.Tips:1. When you are filling the bag, do not use boiling water, about 85°Cis suitable.2 ...