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 they plastic?
Document: These are just plastic but they look cool as heck and are quite bright I got mine on sale cheap and am happy with them
Purchased for our deck by pool. They look absolutely beautiful! They are made with high quality not like the cheap plastic ones.
Great item for the price, works great. I wasn't expecting them to be plastic, so the description was a little misleading, but for the price cannot complain.
great looks. fits well on 4x4 post. battery cover cheap plastic broke while opening to install battery. very poor light emission.
It's plastic and can crack and break - especially when your son hits them with a basketball several times. Other than that it looks good and works as advertised. I have got a lot of compliments on them.
I replaced the battery with NIMH, and now it stays on all night. It gives off a nice white light. Be advised, this a "Copper" colored plastic light, but it is decent for the money.
After testing a few other post-cap lights, my neighbor and I purchased enough for both our properties. The soft glow in our yards is just what we were after..The copper color, although plastic,sets an aire of quality that compliments our new fences.
I ordered three of these caps and all three arrived broken...not due to packaging....that was fine. Two had broken on/off switches, two had broken plastic parts. I am very disappointed, especially since these were rated high by other customers.
These were nice looking and worked as expected for the first few months. By the end of 1 year, everyone has failed. On some, the plastic covering the solar panel has turned opaque. None light up at all now.As a note - I think they are copper colored plastic, not real copper.
I ended up getting my solar post covers from Ebay .... set of 8 cost $63 (about $8/light)they were not misrepresented as "copper" (which is a metal Cu) but represented honestly as plastic that is copper colored. They are nice....I wonder how much real copper costs.
Answer: yes