1. It Is Safe - Material Is What Makes Products Different. Lock & Lock Uses Heat Resistant Glass That Does Not Have A Risk Of Breaking Itself Or Spreading Fragments Even If It Means Bearing A Greater Cost. 2. It Is Light - Heat Resistant Glass Is More Than 10% Lighter Than Tempered Glass, Lifting A Great Weight Off Of Users’ Wrists. 3. It Is Clear - Lock & Lock Oven Glass Is Less Likely To Be Become Murky. It Always Stays As Clear And Pure As New One. 4. It Heats Up Less - With Its Low Permittivity, It Makes Food Warmer While The Container Itself Gets Less Heated When Used In The Microwave. 5. It Is Heat Resistant - As Lock & Lock Oven Glass Is Made Of Borosilicate Glass That Has A Strong Heat Resistance, It Can Strongly Withstand The Heat And Rapid Temperature Change. Therefore, You Can Use It Not Only In The Microwave But Also In The Oven.