This is a set of 6 tall crystal tumblers by Lenox.  They are marked with a cursive "L".  The tumbler measure 6 5/8 inches high.  They have 8 vertical cuts and the bottom of the tumbler is squared.  They are very heavy tumblers and each one weighs 1 lb 6.6 oz.  They are in very nice condition with no chips, cracks or cloudiness.