1.5″ x 1.5″ white specimen trays, easy to self assemble due to the unique design which has the card shape already cut out and scored along the edges which will require folding. Once folded, the card tray holds its self together easily, creating a robust holding unit to house your rocks, mineral or fossil specimens with ease. Flat faces allow you to affix labels detailing the trays contents. Each tray measures 38.1 x 38.1 mm when assembled and stand 20 mm high.