1,Our joist is a new kind. 2,The color can be truly even and consistent. 3,It looks greatyear after year. It has a long lasting life with a minimum of care and maintenance. It can be truly natural, kindness, no painting, no staining,no rotting and no termites, easy installation, excellent fire-resistance. 4, Specifications: 1) Item No.: WPC SJ40 and SJ30 2) Material:WPC panel& Hape 3)type: two types SJ30 and SJ40 3) Thickness: SJ30---30mm,SJ40---40mm 4)width:SJ30--50mm,SJ40---60mm