These are stainless steel jackets, not titanium. below is a translation from Rays site.

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"This product uniqueness processing (the ion plating) has administered to the stainless steel jacket, very for delicate, when the wheel cleaner and the like of marketing is used, the worst, there are times when fading and changing color etc are caused, when especially strongly the acidic substance comes in contact alkaline strongly, because there are times when changing color and fading etc are caused with the chemical reaction the case of care, in regard to use, the abundant moisture making use of the soft cloth and the like to wash the neutral detergent, after wiping off sufficiently, please make dry. Concerning handling, the “instruction manual” is well read, protecting care method, use."

So these are rims are a 2 piece made by cast flow forming, then a stainless steel jacket applied to the lip to reinforce the lip. so these will weight more.