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We can speculate the pistons are of a high silicon content and that funky crown shape for good combustion may give additional strength. The Japanese have used steel top rings for years in many applications... being that close to the chamber the 1.2mm ring would have to be steel. Remember...

Mahle produces good stuff, nice to see those in there... Rings keep getting thinner in order to reduce friction... better materials have allowed it to happen. Too thin, though? Guess we will see...

The above info on the 2UR is incorrect... only one piston size is used, just like the 3UR.

It dosn't sound like lifters, it sounds like loose pistons to me... I'll also say it is all speculation. Some say it is the dual VVTi.... I'd be happy if I am wrong. Toyota says that machining precision has been improved so only one piston size is required, yet the 2UR-GSE is still select fit...

I'm quite interested in the piston to cylinder wall clearance. Toyota does not select fit pistons on this engine, one size fits all. Many, including mine, have cold start rattles that sound like piston slap... non select fit and increased clearance specs have me wondering.