With their superb tracking ability, Acoustic Pro triggers set a new standard of trigger mechanics. With absolutely no adhesives required, the ddrum triggers clamp onto the sides of standard drum hoops.Includes 5 Triggers total. 3 toms, 1 snare and 1 bass drum Trigger- Snare Trigger is Dual zone and should be used with a ddrum 6997 Y cable- All other Triggers should be used with the Ddrum 6999 cable. Or any after market cable that is balanced and has PIN 2 hot.