Quite surprised by this one to be honest, it's very well made and durable. Stability and how well it holds in place does depend on hoop shape though. Examples: an inward shaped S-style triple flanged hoops offer a little "twisting" motion. Sonor Vintage Superprofile hoop has an ok fit. A standard outward shaped hoops offers perfect fit.
Application: Great for woodblocks without a need to add an extra stand or arm. If you fit a rattling instrument like tambourine or Meinl crasher, and hit the skin, the vibrations will of course trigger the percussion to go off, so bear that in mind.