These ice blocks will provide an instant cooling effect that will keep your food and drinks nice and chilled all day long Once frozen the blocks stay ice cold for hours These high quality heavy BPA free freezer blocks are reusable, long lasting and made of leakage proof BPA free plastic casting Perfect for lunch boxes, sandwich bags, cool bags, hiking, camping, picnic and keeping your food fresh and drinks cool during the warmer months Each Block Measures 16.5cm x 10cm x 2cm. Available in two, three, four, five and six pieces.