Description: This Violin Cello Wolf Tone effectively tames wolf notes It fits on the string below the bridge It is a golden-plated brass with rubber sleeve wolf tone that matches for Violin/Cello This is a steel tube and mounting screw with an inside rubber sleeve that matches round the offending string beneath the bridge Different placements of this tube along the string influences or eliminates the frequency at which the wolf happens It is largely an attenuator that cuts down at the unusual reverberation Specification: Material: Brass Size: approx Violin wolf tone: 7x11mm/ 0 Cello wolf tone: 11x12mm/ 0 Color: Gold Shape: Cylindrical Package Includes: 1 Piece Violin/ Cello Wolf Tone Note: Colors is probably assorted because of diverse monitor show Please enable slightly distinction in length thanks to manual dimension