Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Is there outer threads on these?
Document: After debating between Hoya & B+W, I ended up w/ the Hoya HD CP; and I am very glad that I did. The B+W Slims have no front threads, so it difficult to keep the front lid on.As some testing reviews mention, the new HD CP are very thin, durable and let more light in than any other CP I have seen. Now I can keep my filter on, even when shooting indoors w/ no problem. I am quite impressed.
Many lenses and filters are obscenely overpriced. I suppose the Asians don't trust our money, who knows. This filter produced excellent results and was competitively priced. The threads don't stick and it has a knurled ring to make attaching/detaching it easier. It comes in a plastic clam-shell protective case. But I keep it on my lens 99% of the time. These filters lend themselves to even indoor lighting situations without degrading the image. I pretty much use CPL's rather than UV filters.
very expensive , but i am looking forward to test it sooni received it today and unboxed it.it comes in a round protective plastic case and looks solid and great quality .i mounted it on my Nikon d7000 simply an awesome filter.
this polarizer was just what I needed for my new lens. I have used it a couple of times and it works well.
Very nicely made. However it jams against my Zeiss UV filter and I almost broke it trying to get it to come loose.
This purchase met my expectations; I knew what I was buying and the seller fulfilled that need. Thnka you for a positive buying experience.
This is probably the best on the market. I don't know of anyone else who is even comparable. It's worth every penny
This is a high quality filter, a must have, mainly for outdoor sunny picks. I am very pleased with the results using my telephoto lens. Thanks for your business.
This Circular Polarizer does exactly what I expected it to do, and it does it well. The coating is good and I've not noticed any additional flare/glare/reflections that shouldn't be there. The filter itself is a bit bought to get clean even with a lens pen but not impossible.
The quality is excellent. I'm still trying it out ( I am keeping it) attached to lens with ease. I'm just still very excited to try it out under many different conditions. Anyone wanting to buy a polarizing filter should read why and how to use it if you do not already  know. Thank you Amazon for great service.
Answer: Yes outer threads