1)PE, Dustproof,Security 2)single stick lable can not be get over after used 3)bottle cap keeps no water ... less than 2mm.The label on the center of 5 Gallon caps. The deviation between label and caps center diameter ... apparent ruffle, become warped edge, Stick label and 5 Gallon caps heat sealing are strength.when taking off label,the ... appear warped edge,roll edge and loose. New PE 5 gallon bottle cap