Tapping, Triplets

The most common one involves rapidly repeated triplets played at a rate of sixteenth notes, using the following sequence: Tap pull-off pull-off In this case, the right hand index or middle finger sounds the first note on a string by sharply hammering onto it once, then pulling off (often with a slight, sideways 'flicking' movement so as to strengthen the note) to a lower note held by one of the left hand fingers, that of which is then finally pulled off to the last note held by another left hand finger. From there, the cycle is repeated. If one breaks that down even further, the very first part can be seen as the actual 'tapping' motion itself, whereas the second part involving the left hand acts as a way of embellishing the passage with additional notes; which, overall, could be considered an extended trill. The overall aim is to maintain fluidity and synchronisation between all the notes, especially when played at speed, which can take some practice to master.

Source: Wikipedia > Tapping