1,Strong zipper, OEM service, LDPE,HDPE material all ok. 2,all size can tailor made, different logo printing,up to 12 colours. 1,Plastic zip lock bag with strong zipper on the top,making the bag reclosable2,Our advantage is printing, we can print more than 12 colours;3,Widely used in supermarket,chain store,household and gift,necklet,electronic stuffs packing.