This is a pair of Positron 2.2" 4WD Front Buggy Tires. S3 is Pro-Line's latest and greatest compound that has been tearing up the track and winning races at the highest level. S3 is similar to X3 as it is a Soft and long-lasting compound but S3 is a substantial leap forward in terms of grip in dry and slick conditions. Another massive improvement with S3 is that stays stable throughout long main events and does not fade or get soft near the end of the race. Just ask Ty Tessmann who used the new S-compounds to sweep all the classes at the 2018 1:8 ROAR Nitro Nationals as well as the 2017 1:10 ROAR Electric Nationals! Don't get left in your competition's dust, take the win with Pro-Line's new S3 compound today!