... welding rod 1.anti-microbial,stain resistance,environmental friendly,non-toxic 2.diameter:3mm,3.5mm,4mm or 5mm PVC welding ... 5mm.100m/coil Featuresanti-microbial,stain resistance,environmental friendly,non-toxic, water resistance Colour a wide range of colour to match ... adhension ,stain resistance and easy to be trimmed off . non-toxic pvc welding rod with the diameter 4mm