The GPM TXMM087/SP Progressive Spring Set provides adjustable spring rates for the Traxxas Mini Maxx, enabling more precise suspension setup. This kit includes three pairs of springs with measured wire diameters: black 1.1mm, silver 1.2mm, and gold 1.3mm, giving a clear progression in stiffness for tuning preload and response. The springs are intended to deliver a progressive compression curve that aids in balancing traction, weight transfer, and landing control during demanding runs.