Hose wall made of ether grade (microbes and hydrolysis resistant) abrasion resistant polyurethane (wall thickness between the spirals 1mm/ 1.2mm/ 1.5mm/ 2mm/ 2.5mm) with copper coated spring steel wire reinforcement. A heavy duty flexible hose with shore A -85. Hose with 1.2mm wall thickness is almost smooth interior. However, hoses with 1.5/2/2.5mm wall thickness are all of perfectly smooth inside, with high tensile and abrasion strengths and ultimate elongation. Free of softeners, halogen free, physiological safe, cadmium free and produced in line with FDA regulations. Although the above three varieties are used for material handling for extremely abrasive goods, please select only 2.5mm thick hose for elevated temperature use up to 100°C.