ETA hand2mind Streak Planes, 2 x 2", Pack of 10
United Scientific Glass Streak Plates, Pack of 12
White Streak Plates - set of 10
American Educational Glass Streak Plates Kit, 1/4" Thickness (Pack of 10)
Toysmith Mineral Science Kit
Geosciences Industries 13357 Introductory Earth Science Classroom Rocks and Minerals Collection
Deluxe Hardness Pick Set and Mineral Identification Kit, in Wooden Case
American Educational Hardness Collection with Test Kit
Mohs' Hardness Test Kit for Industrial Applications
United Scientific GLP3X2-P Glass Streak Plate, 3" Height X 2" Width X 1/4" Thick (Pack of 10)