Identical to the SHS M4 Cylinder Head (PAD). Made from aluminium. Has a rubber pad on the bottom where the piston head connects together with 2 O rings for improved compression. Due to the slightly thicker o-rings I find the SHS / Rocket version to be very tight on cylinders which have an internal diameter or 23.8mm or less. All manufacturers tend to differ slightly so please check. A good alternative is the XT cylinder head.
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