Rotary/STENS Cylinder kit?

[Okie294life]

Are these any good? I generally like rotary brand stuff for lawnmowers.

 

[RED-85-Z51]

Ive used Stens kits for years and the quality is nice for a low to mid price kit..have not seen any failures to date due to a part issue

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[Mad Professor]

Are they made of 100% pure chinesium?