Lup-X Wolf Eliminator for cello. This original model is manufactured to high standards with quality design and threads. Beware of copies! Highly polished brass contains no rubber or other material that may dampen sound
Like this better than the ones with the wavy slot because I don't have to loosen the string to apply or move it. I found that moving it up and down the string even a little can make a big difference.
I think it looks better than the ones with the screw, too.
Very glad to be able to get the lighter 5.5g version.