Pearl PGA-60FP Field Percussion Shaker. The Pearl PGA-60FP Field Percussion 21" Shaker is specifically designed for outdoor use; never fear taking your percussion instruments outside into the elements again. Pearl's Field Percussion instruments have a protective, textured black lacquer finish to match visually with your ensemble, and come outfitted with resilient all-weather Remo NuSkyn and Fiberskyn heads for indoor and outdoor use.