... extruded be professional wood-plastic extruding machine under high temperature and pressurre.so it is a kind of insect proof ... less cracking,less warping.d.well done of termites,insects,and moldy-proof.e.available in diffrient colorsf.easy to ... and clean.4.certificate we could supply:ISO9001,ISO14001,CEcertificate.etc5.colors we could supply as follow6.Engineering7.packing ecological and durable ...