Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Are these sights steel or polymer?
Document: Most people prefer the 3 dot sights, which I am not accustomed to, so I thought I would try these out.I must say, I really like them. The sights are steel, front orange is great in the light, and the green tritium is very bright in the dark or low light. Lining up 2 sights is much easier and makes it much faster to acquire your target.
Very accurate, high quality sights.
I really LOVE these sights. The front is great for quick target pickup. Purchased the lime green for my Shield also.
These are great sights if your looking for quicker target acquisition. The florescent front sight stands out during the day and the trijicon inserts are bright at night.
Completely worthless. night sights were so dull you could hardly see them. The orange dot during the daytime only shows with the sun shining directly on it from behind your back.
Good sight picture. Easy to acquire in low light. Easy to install. Recommend over standard Glock sights. Installed on Glock 19 gen 4.
They also work really well in the day time. The stock sights on my gun are terrible. Very happy with these sights. The gun shop that I purchased the gun from installed the sights for free. YMMV
Yep. The title says it all. The front orange blade is easy to track no matter what and the rear dot is just enough to help index the sights in low light without being as distracting as the three-dot variety.
These sights work well and are good value for the money. The sights are well made and have taken a beating and don't even look like they have. Reason for the 3 stars, only the front sight glowed and not very brightly. The rear tritium didn't work at all.
I bought these sights because of the sight option and the price. When I opened the packing I found that the sights are made by trijicon (for half the $). I'm very pleased with them. Working as a Sheriff's Deputy I have come to love this set-up on my duty carry side arm.
Answer: yes