large quantity of mica windows various thicknesses and most can be sliced thinner about .02 thickest and some quite thin a layer or 2  very clear and strong some thicker ones have a darkershade  largest is about 2-1/4 by 3-3/4 plus ,, rough cut pcs ,cut to desired shape round etc use for mica window on oil burner to view flame at a glance ovens insulation looks to be hi quality old stock new stored a long time/decades over 13 oz all for one money