Blickle white spo heavy duty nylon wheel tyres and treads blickle 498774 this white spo 12720k heavy duty nylon wheel tyre and tread oslash 125mm from blickle is made of high quality impact resistant nylon with a very rugged heavy wheel designoffering very low rolling and swivelling resistance smooth running performance on even floors and very high abrasion resistance along with high chemical resistance to alcohol salts grease and certain acids and bases in diluted concentration b