The first rack holds 6 5ml bottles and the second rack holds 7 roll-on bottles I also have a rack for the 15ml bottles too. I designed them to fit in the lid of the wooden box I have. they can also be set on the bathroom counter or even hung on the wall with command strip tape or the nail holes i put in the back. all work well. I have made about 12 of these and have not had any problems with the prints. Happy oiling.Printed them with a makerbot 2x on fastest settings no raft and no supports