Overview Reviews Product Description Medium. Clarity with pure tone through the full range of the instrument. The most versatile vibe mallet in this series. WARNING: Cancer and Reproductive Harm Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × Vic Firth Vic Firth M266 Corpsmaster Keyboard/Ian Grom-- Medium Vibraphone Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments