These keycaps have topre stems.  All keys are 100% resin cast: there is no coating or surface treatment.  
 
Hocus Pocus is thermochromic black-to-pink with a faint mica sparkle.  At 77F/25C, the cap will color-change from black to purplish pink.
 
Spacebars have Topre stems and interface with standard HHKB stablilizers, and also have party-horn bump pads.