These specialized bases are actually trays that are designed to hold silica gel and let the air within the case circulate through the silica. This is very useful in buffering humidity levels that the art is exposed to. Acrylic cases must be used with these bases and are sold separately. Silica gel is also sold separately. Please allow one to three weeks for delivery.

ancientartifact.net

ancientoillamp.net

museumdisplay.com

museumdisplaycase.com