This set is made of borosilicate glass and is safe for oven, microwave, freezer, and dishwasher use. The set includes 8 containers with capacities from 5oz to 35.2oz, suitable for various storage needs. They feature a leak-proof design with snap locks and silicone seals to prevent leaks and odors. Price drops from $60 to $27.99. Shipping is free for prime members or orders over $35.