The GZM6 from CAD is a professional-quality microphone shock mount. The mount is made of metal for a long life of professional use. The simple basket design and heavy-duty elastics provide ample protection against unwanted bumps and vibrations. The GZM6 is designed for use with the GXL3000, GXL2400, and GXL2200 microphones.
I bought a couple of these to use with a pair of MJE-v250 microphones, and they work well. I'm sure for this price they aren't equal to name brand shockmounts, but they work fine to isolate the microphone from bumps and vibration, and strong enough to hold a decent amount of weight.
Does a nice job of defraying virbrations to my CAD mic, and is very inexpensive.