... with tire/polyurethane tire it is free of air inflation, abrasion proof, anti-corrosion. RIM/pu filled with tire/polyurethane tire:It ... is a band tyre, which is free of air inflation, abrasion proof, anti-corrosion, harmless even in nail prick and therefore long ... in resilience and can be made in different colors.PU material filled into rubber tyre:The inflation free tyre is light ...