It says "STS", but I couldn't find any sign of it on the STS site.
I've got an STS on my vertical bow, and I'd definitely be willing to spend that much on one for Excal, too. Just thought I'd check and see if anyone else had tried this particular product out yet and had anything to say first.
That does not look like the one made by the company in Tenn that makes the STS. They actually were/did make some last year. I remember it being posted on this website then.
They are available from "Ye Olde Archery Shoppe" for $47.99....I bought one today from a local Tennessee bow shop and paid more than that. According to the bow shop, they are next to impossible to find....Well made cast aluminum same color as Vortex rail. It seems Excalibur would sell these as they are a custom fit. Bolts directly to the riser in the factory hole. Has some adjustment with set screw on bottom. Bow shop dude said they had sold all they had and were waiting for more. He said all the Excal users loved it. Haven't shot bow with it yet....
We tested a set last year on a Max and they did reduce the sound the bow made, but only for about 50 shots then the rubber bits wore through and noise was louder due to the string slapping into the steel post the rubber sits on. We were considering making them part of our line till that happened.