Materia type: Stainless Steel; No. of containers: 4; Capacity of containers: 4 Containers: 300ml Each; Contents include: Lunch Box Set With 4 Containers + 1 Carrier + 1 Bag; Colour: Black & Silver Best usage: Office, School, Outdoor; Microwave safe: No; Leak proof: Yes; Insulated: Yes; Keeps food warm upto Long Hours Other features: Available with jacket, easy to carry around Conatiners are totally leak proof and Vaccum insulated Tiffin Single wall fridge bottle with inside outside stainless steel made of grade 304, which is rust free Convenient size fits in the side pocket of bags which you can carry for school, trekking or office, car bottle holder etc This bottle is easy to clean and maintain, Use a mild detergent or dish wash liquid and clean on the inside with a bottle brush This Bottle is unique in shape, it has leak proof technology, which make this product easy to carry at school, travelling and work, it is Odour Free and 100 percent Food Grade