PEARL MASTERWORKS. THESE COULD BE 8 PLY AS SLIGHTLY THICKER SHELLED THAN MY PEARL MASTERS 6 PLY. TOM SHELL BANK. REALLY NICE SIZES AND THE 14 AND 15 WORK BRILLIANTLY TOGETHER WITH PLENTY OF NOTE SEPERATION. THE 15" CAN GO AS DEEP AS A 16" BUT HAS NOTABLY MORE 'PUNCH' !