Luciano, 2-pc Silicone Sealing Lid Set, 8.5 x 8.5 inches, Clear Small measures 4.5" that stretches to 6.5" and large measures 6.5" that stretches to 8.5" in diameter Made of silicone Environmentally friendly as it is reusable Versatile, stretch to fit any square, round, and rectangular containers Freezer and refrigerator and Tock rack dishwasher safe