Flip Top Cap can be named butterfly cover ,because the cap hinge part is like the butterfly ,Which belongs to the high technical mould. All Flip Top cap have a common feature ,the hinge part is the most important for the whole cap. Now the flip top caps are widely used in lots of area ,such as cosmetic ,detergent packaging ,edible oil packaging ,some medicine packaging and also some water cap packaging. http://www.capmold-china.com/