1)Size :80mm 2)Factory price,good quality 3)Long life and circulating using 4)50pcs/box,ISO9001:2000 Features:1 The rate of leaking within 0.3%,the rate of inflaming over 98%2 Customer's designs and logos are welcome3 High quality,copetitive prices,good services4)Long life and circulating using5)Passed ISO9001:2000 Welcome your enquiry and customise at any time.