very sticky
the abs does get quite sticky if you run if for 3 or 4 races. For one it picks up all the tire compound and foam residue and for another the intense heat that's generated by spinning at high speed on carpet tends to soften the plastic. I made it through all 4 round on one set, but it was new at the start of the day. Other who started with used sets had problems by the end of the day. You really dont want to run on asphalt and then use them on carpet as all the grooves and scratches pick up more crap. On the other hand you can clean the tires off a bit by running them on medium rough concrete between runs.