Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: Are these grips brown or black?
Document: I think I will be quite happy with these grips; if not, I will update this review.
I've had these on my bike for a couple weeks now. Really comfortable grips. Much nicer than what Trek provided from the factory.
i've been using these grips for quite some time now. mounted using hairspray as others recommended. worked great. they are comfortable.
These grips are very good. Feel great in your hand and go on very easy. Note that they are made for twist shifters only. 5 stars
Fit great, look great. Not very soft, but still comfortable. I would recommend them if you need 90 mm grips.
So far so good on these. Good thickness and solid feel. I would recommend these to people who need nice quality, low cost grips.
Purchased these grips for my bike to replace ones that had been worn out. They were a little too long, so I had to cut them to fit perfectly. Otherwise nice feeling grips.
had trouble getting to stay in place dont.know if the bar or the grips where the issue . But little hairspray and they work fine would order agai.n
Much softer rubber than my original grips really like the ergonomic shape. fits with grip shift, installed with hair spay and they have stayed in place.
These are perfect replacements for the worn out grips on my son's Trek. He has grip shifters so he needed a shorter replacement grip. These worked out perfectly. The quality seems pretty good.
Answer: yes