Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Are the shelves adjustable?
Document: This was ordered as a gift to our son -- I feared that the glass shelves would not survive the shipping process, but the unit arrived double-boxed and in perfect condition! The unit appears to be very well constructed and displays his glasses nicely.
This is a really sturdy and well made display case. I bought it for my husband for displaying pewter figurines. It's perfect for this purpose and could not be happier with it. It really is a nice display and is as described.
I ordered two of the display cases and they beautiful. Very well put together and sturdy. They are for my husband and he is really impressed by the quality of this product.
I gave this to my husband as a birthday gift and he loved it. It's a nice quality shotglass case. I would recommend buying this product to anyone looking for a shotglass case.
I bought this for my daughter as she is the  one that collects shot glasses. She loves it.Very nice product.
I bought this as a birthday gift for someone who collects shot glasses on their many travels! They had been wanting one but didn't have the time to search around! Being that they are the type of person that has everything, I thought this would make a cool gift! They LOVED IT!!! The cabinet is beautiful, well made, and goes perfectly with their decor! It was priced very reasonably, and I will not hesitate to buy from this seller again!
Great product and fast service! My shot glasses look nice in the display cabinet and the shadow box was easy too install.
Answer: If by "adjustable" you mean the shelves can be put in or taken out, then yes. If you have taller glasses, then may I suggest leaving one or more of the shelves out!