Tempered shower glass. Excellent condition. Measures 3/8 thick x 40 1/8 x 40 3/4. Very sturdy and heavy piece! Was used as part of a shower/bath surround. Can provide another piece if desired measuring 40 1/8 x 23 1/2 (for an extra 50$) These were supported by silicone butted against a wall and was very sturdy. Of course, using mounted clips work very well also.