This Kyosho W5312-06 shock piston is an RC-scale replacement part sold as 2 pcs, sized for DC13 style shock assemblies with a 2.0-350 specification. It is designed to fit LAZER ZX 7.5 and Ultima RB7.5 shock units and controls oil flow inside the shock body to produce consistent damping response.
In real-world setup the piston alters both low- and high-speed damping by changing flow area and pressure characteristics when paired with the correct shock oil. Inspect piston edges and fit on the shock shaft before final assembly to prevent seal wear and uneven damping.
Choose these pistons for like-for-like replacement or to test alternative DC13 hole patterns as you refine suspension balance on 1/10 touring car rigs.
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