Top Hat Tube Dampers?

Herbies UlraSonic rx rings are MUCH better better bass,more air etc.

Thanks for the info. I thought it was Elmer's, but didn't want to try until it was confirmed.
I'll let you know what I think about them, after I install them (probably tonight). I'll be using them on a couple of tubes in my phono preamp (Fosgate).

Listened to the Fosgate last night with the Top Hats installed. There was an improvement in the quietness of the background. Music came from a more black background. It was quieter, allowing me to hear deeper into the music. This was not a night-and-day difference with vs. without the top hats, but I do like what they are doing. I'm going to search the internet to see if I can buy another pair from someone, as the instruction manual makes a comment about the effect being cumulative. Thanks again for helping me identify what glue I needed to use.
Happy New Year!