This is a set of two Jaco Prism 1/12 Mounted Foam Rear Tires, in Gray compound. JACO uses only the highest quality foam sheets from around the world to produce their tires and they always incorporate the "freshest" rubber in their tires to ensure quality & performance. JACO does not buy "donuts" from other manufacturers. Since JACO laminates, cuts, trues and grades the foam in house, they have total control over the production process. The Prism rear wheel features a larger size and a 3-mm offset. This allows the hubs to mount closer to the center line of the wheel which helps the wheel run true. This will allow for the expansion of the rear pod to allow more room/easier access for brushless motors. The best part is that less rubber on the wheel means lower retail price to consumers.
JACO is also involved in other non-R/C related manufacturing. This, unlike other tire manufacturers, gives them an incredible advantage with making sure their batches of foam are consistent and true. Anything that doesn't meet their strict grading system is used in other manufacturing projects. All JACO tires are produced on state of the art computerized machines. These same machines cut custom, high tolerance products used by the US Military and the Auto industry.