The GPM MZA338 dampers are produced as a precision upgrade for Kyosho Mini-Z AWD models to reduce internal friction and provide a firmer, more controllable suspension response. These aluminium units are intended to improve balance and allow finer tuning through spring selection and preload adjustment. The set contains both silver and black springs and uses adjustable top spring retainers to change spring hardness without complex disassembly, offering a durable and tuneable option for serious hobbyists.