I saw them advertised on amainhobbies.com. Kinda interesting.

These tires are the latest hot tire from Panther and have a racing tread pattern similar to the very popular Komodo Dragon 1/8 scale buggy tires and Python Monster Truck tires for incredible traction! This tire was designed to fit standard MAXX sized rims but be thinner in profile profile than the regular MAXX Bow Tie tires, measuring 5.7" tall and 2.75" wide. Perfect for carrying maximum corner speed on the track! This new tire also has a reduced tread "core" thickness which dramatically reduces the overall weight of the tire, which weighs a scant 135 grams.