Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: Are these really glass or plastic?
Document: I have written about these before. They are plastic junk and they should say plastic and not try to pass them off as glass. You really have to read the ad carefully. You get what you pay for.DD
well packaged and beautiful. I couldn't have been happier with product and price. Really beautiful glass knobs that don't look cheap at all.
I had priced knobs like these from a specialty knob and pull store and they were quoting $15 to $17 for glass knobs. So glad I found these! They were exactly what I was looking for and when they arrived I was so pleasantly surprised at the weight and quality. I am particular and I am thrilled! They resemble Swarovski crystal balls and really dressed up my bathroom!
Nice item for the price. Not true glass of course, but what I expected. Unfortunately each is wrapped in plastic that is a complete pain. I still don't have it all removed.
Love these. Remodeled the kitchen and these were the perfect jewelry for a black and white classic kitchen. Has a plastic wrap around the glass part to protect. Loved them so much ordered more for a hall linen closet and bathroom.
Bought these for my daughter's room. They are plastic, NOT glass, but I am still happy with the purchase and the price I paid for them. They do look like real glass, however. They are a little on the smaller side, so check measurements before buying.
The knobs are not glass as stated & several of them had the shiny silver plastic (not metal) part disconnected when they arrived. However, they do not look as cheap as they are once on the dresser I purchased. If you are looking for a glass knob, DO NOT BUY THIS PRODUCT.
I should have read the item description better these are acrylic not glass Item titles says glass clear  not clear glass should have returned them . a couple bucks more and I would had crystal  My Fault  but if you want Plastic I guess they are ok
For the price I expected these to be a cheap plastic version, but I was pleasantly surprised by their weight and quality of glass. They look great on my bathroom vanity drawers. They were wrapped in so much packaging and plastic, I felt guilty for what I was doing to the environment.
These are OK, but they are NOT Glass, they are plastic. I ordered these and the larger ones for a dresser I had re-finished (and some future pieces). They're fine for the price, but they are advertised as "Crystal glass and alloy", but they are more accurately, "Plastic and Plastic".The larger ones are glass and some type of alloy, as described.
Answer: yes