SAFE & STURDY - Made of High-Quality Material that is BPA-free, Microwave safe, Dishwasher safe (Top Rack). Note: Extreme temperature change will cause glass cracking. DO NOT take any glass from the freezer and put them in boiling heat directly or the other way around. DO NOT overheat them in the microwave. DO NOT heat them with lids on.
LEAK PROOF - Each jar has leak proof, easy to use, screw on assorted color lids. Free lid labels for marking contents and expiration dates.