The Imirie shim is made from the same quality wood as all our other wooden products. The Imirie Shim is a nice piece of equipment to have around. Its a 3/4-inch rectangular rim containing a 3/4-inch notch cut 3/8 -inch deep front middle. One use is to place it on top of your honey supers to allow for additional room for forage bees. Also it also help provide hive ventilation by placing it beneath the inner cover. Proper ventilation helps maintain hive temperature and also makes it easier for bees to dry honey down for capping. Available in 10 and 8 frame.