Blickle white spo heavy duty nylon wheel tyres and treads blickle 6890 this white spo 7515k heavy duty nylon wheel tyre and tread oslash 75mm 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 blick