any recommendations for decent bone conduction transducers?

i came across this bone conduction transducer and had a look online but it doesn't seem like they are widely available. i guess i'm a little confused on terminologies here as a quick search for "bone conduction transducer" shows up very little - and some of them look like regular surface transducers.

in terms of terminologies are exciters and surface transducers the same? are bone conduction transducers the same as these or are there slight differences in how they are designed that define these differences?

does anyone have any recommendations for decent "bone conductors"?

thanks!
 
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