1 ISO9001:2008 ACS ROSH certificate 2 flexible tranparent,non-toxic,resist UV,bend into a ... cover.· distance average between each ripple.· no flaw, poison, smell.· flexible, soft, bend naturally. ◊ Technical data · Inner diameter size range ... Production Line :◊ VOKO Hose Quality certificate : 1) FDA (Food grade ) 2) ROHS / SGS (European environmental protection ) 3) ISO9001:2008 soft , flexible ...