This is a set of four JConcepts Mono 12mm Hex 2.2 Rear Wheels, and are intended for use with the Associated B4.1, B44.1, and Kyosho RB5 1/10 buggies. For many years the standard setup on Team Associated 2wd vehicles has been a proven bearing front wheel and pin-drive rear wheel setup. Times have changed, and JConcepts - Mono 12mm hex wheels are the latest accessory available for the Team Associated B4.1 buggy. With the recent release of Team Associated’s 12mm hex conversion, converting to a more durable interchangeable wheel setup is easier than ever. JConcepts replacement wheels are designed in the popular dish style and available in bright white and fluorescent yellow. When Team Associated makes an update, JConcepts delivers.