These are made of metal and wood. Three are LISCO and three are ALKON. A 7th Lisco film holder, which needs one darkslide, (see tape) is included, as is a Graphlex film Pack Adapter http://www.hemenway.com/ForSale/2x3-filmholders.jpg $29.00, includes Priority Mail in the USA. Jim - http://www.hemenway.com