Pyrex bakeware is durable, transparent for easy monitoring of baking progress, and provides good heat conduction for even, consistent baking. Safe in the oven, microwave, refrigerator, freezer, and dishwasher. Glass is nonporous, so it won't absorb food odors, food flavors, or food stains. 9-1/2" x 1-1/2". Online purchases are in packages of 6.