JConcepts extends the tuning capability of the Regulator chassis conversion by offering a stackable chassis weight. The machined brass unit can be easily added to the bottom of the chassis to increase weight to one of the lowest locations on the vehicle. The design allows the ability to stack additional weights if necessary to the same footprint with (not included) hardware. Weight added to the chassis area on a retro monster truck can improve suspension performance by increasing the sprung weight. This allows for better jump handling and landing and the ability to plant the tires into the racing surface via front to rear weight transfer. In several sanctioned RC racing events, it's helpful to be able to add additional weight to make minimum requirements for competition. JConcepts now has several tuning items available for the Regulator chassis kit to make adjusting on the fly or for certain events worry free. The product is always backed by JConcepts customer service, supported, and developed by professionals with style and authenticity. - Precision machined, brass material - Solid weight placement positioning - Stackable design and construction - 1 stackable piece included per package