They are made by ART the Japanese piston company that makes Suzuki OEM cast pistons.  I have used a lot of them over the last 30 years in OTHER engines where the OEM pistons are reliable.  The OEM piston is not reliable in a modified or and engine that the clearances get a little loose.  They will shatter in the LT500 just like the OEM piston.  The skirts are too thin.

I also have some of these if someone needs a piston for a completely stock engine that will never be over-reved or punished.