Kato 24-848 N Scale Stop Signal Button Train Scenery Stampede Parts and this updated version reflects

and this updated version reflects Losi's latest specification for improved braking performance over earlier discs

Withstands centrifugal forces at speeds in excess of 100mph

Kyosho lists them across the Inferno GT2 VE Race Spec

Aluminum front upper brace

and rollovers

Kato 24-848 N Scale Stop Signal Button Train Scenery Stampede Parts and this updated version reflectsKato 24 848 N Scale Stop Signal Button Train Scenery Bring interactive control to your signal system with the Kato stop signal button. This pushbutton control works with Kato's signal components, letting you hold trains with a stop indication at the press of a button a fun, hands on addition for operators of all ages. It connects using Kato's standard plug in wiring, so adding it to your Unitrack layout requires no soldering or wiring expertise.