Part 3 · Rudiments · Chapter 32
A flam is two notes played almost together: a very soft grace note followed immediately by a loud main note in the other hand. It sounds like one fat note: “fl-AM”.
Start with one stick high (it will play the main note) and one stick low, just above the head (the grace note). Drop both at once. The low stick lands first because it has less distance to travel.
The sticking shows the hand that plays the main note. The grace note is played by the other hand.
A flam on the beat, then a single tap.
After each flam, the hand that played the main note must end low (ready for the next grace note) and the grace-note hand comes up high. The whole rudiment is really about stick heights.