MATERIAL TYPE POLYETHYLENE. SEAMS GOOD. CAUTION TO DIMENSIONS. I WILL BE ACCURATE INSIDE DIMENSIONS: TOP 12 CMS - CMS 5.5 WIDTH - THICKNESS 1.8 CMS. YOU CAN HAVE A BELT WIDTH OF 4 CMS MODE VERTICAL AND HORIZONTAL MODE IN CMS 5.5. WISHING TO HAVE BEEN IN MY REMARKS ON ACCURATE. GREETINGS. DANFACO