The Grover GWC-3G Pro Grenadillo Castanets feature an Internal-tension castanets designed for professional percussionists. Features include: -Invisible tension adjustment system -Unobtrusive micro-adjust knob, out of the way of grip area -Durable spring-steel tensioning mechanism (not elastic) -Solid granadillo clappers – UNI-BLOCK construction -Comfortable “timpani stick” style handle -Free protective covers and case -Limited Lifetime Guarantee
