Good construction and functionality.
I purchased these filters with the intent of trying to make a coupler to attach to my 'Point and Shoot' digital camera. I figured they would be a bit lager than the actual lens on the camera. They were and with just a bit of work, I have successfully coupled them to the camera. Of course, when the camera shuts OFF, the filter needs to be removed, and with the coupling rings I made from some generic OTC Pill bottles, it works GREAT. They slide on very easily, and hold on tight, until the camera shuts down, where there is enough pressure to have them easily drop off. The pictures I took, so far using them really show a BIG difference with the UV and Polarized filters. I haven't used the florescent filter much. I'm very happy with these filters.