Traditional pattern Wolf note eliminator. Usually fitted to G string. Chrome plated steel.
The original and often most effective wolf note eliminator. Best for F# on the G string
Cello wolf note eliminator
Pros: Very neat and easy to fit. Not too heavy.
Other: Usual F-F# wolf tamed with eliminator on G string - but still a slight issue with the octave (~4th posn A string). Refitted eliminator on C string which gave the best solution.
Good idea -if it works - fiddly to put on
Pros: Great idea for any dodgy notes if it works
Cons: Does it work? - and it gets in the way of mute. Very fiddly to put on.
Other: Someone should make a viola/violin brass eliminator like the cello ones .. would be neater and look better