NST crank 'pulley' (?)

Had my 2010 DC Sport for a little over a year now, and was looking for underdrive pulleys, as I've used them on previous cars w/ great success.

It appears all that's really available is from NST. Their stuff looks ok, but I'm a bit concerned w/ the design of the crank 'pulley'. From what I can tell, the harmonic balancer and pulley are integrated on this engine. Looking at what NST offers, there's no discussion of it being fluid filled or using an elastomer. To be quite honest, it looks like it's just a single billet piece, w/ no vibration dissipating materials at all. The price seems to be awefully cheap for a HB too.

Can someone tell me what the NST crank pulley uses to dampen crank vibrations?

 

NST stopped making stuff for Tacomas... from what I've heard they work pretty well

 

Ummm, ok?

Again, can someone tell me what the NST crank pulley uses to dampen crank vibrations?