Allows you to precisely control your cooking temperature to achieve perfect results. You can put the food in the r bag into the water until any temperature of 195F / 194.0F. By using a vacuum sealing system, water will not seep into the bag and stain your food, so your food is still safe during the water bath. The use of vacuum bags means that these bags are completely airtight, provide consistent cooking results and prevent floating in the deep flavor bath. The product has specially designed channels that can remove oxygen, form an airtight barrier, prevent taste and prevent deterioration and combustion of the freezer. The vacuum sealing system automatically removes all air from the bag, and then uses heat to create an airtight seal to lock in moisture and air to protect the food and maintain freshness. Easy to use. Simply add food to the bag, insert the open end into the vacuum seal system, and the machine will do the rest-purge all air before creating an airtight seal. colour: white Material: PA+PE Package Contents: 3 x 28x500CM vacuum packaging bags 2 x 20x500CM vacuum packaging bags Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.