From Big Fat Snare Drum:
BFO has 8 sets of Tambourine Jingles to give any HiHat or Cymbal a Sizzle/Trashy sound. The BFO is make from super light weight plastic so you’re hearing the tambourine jingles loud and clear. You can use the Big Fat Octopus on either side. Jingles Up for Medium Sizzle. Jingles Down for Maximum Sizzle.