Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: How wide is the opening?
Document: Perfect size little bottle with a wide opening makes it easy to insert objects! Will be ordering again for sure.
cute little bottles, all with working corks. I got them to store baby teeth in. The opening is pretty small, but they are just so cute.
I read and re read the reviews after I ordered it and they all said the same thing : that the bottle corks break. Who needs the headache? when I got them i sent them back without opening them.
we decided to do Harry Potter for the Christmas tree this year I got these because there were 24 of them I figured that would be enough to go all over the tree plan is to fill them with glitter in house colors and maybe stick some small printable labels on them then put a ribbon around the neck of the bottle and hang. they are small but I looked around and would have been paying the same or more for less than half as many at a larger size and I think they will do the job.
they were cute and easy to use! i really like them but you do need to put small things in so you need to be careful if you want to put a clay piece.
these bottles are small but it clearly states the dimensions in the description. I have had no problems with the corks thus far. you can press them firmly into the bottle and remove them with no trouble assuming you don't just smash them in there. I use them for sending spices as gifts,  and they are perfect for about 1/2  to 3/4  of an ounce of  liquid  or nearly a  tablespoon  of dry material. I will be getting more of these.
these are way too tinyyyy could not use for anything at all like my pinky size
the containers were beautiful, the size was perfect but there was only sixteen bottle ! What ! what happened where is the rest !
the bottles are very well made and arrived packed in bubble wrap, corks are all in good condition, the only drawback for me is these are a bit large to use as pendants. but I'm sure I will find another use for them.
one of the jars was broken.but other wise they were great..t they did come  before the date they were suppose to come!! !
Answer: 1 1/2 cm or just a bit over 1/2 inch