Allows you to precisely control your cooking temperature to achieve perfect results. You can put food in r bag into water until any temperature of 195F / 194.0F. By using a vacuum sealing system, water will not seep into bag and stain your food, so your food is still safe during water bath. The use of vacuum bags means that these bags are completely airtight, provide consistent cooking results and prevent floating in 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 freezer. The vacuum sealing system automatically removes all air from bag, and then uses heat to create an airtight seal to lock in moisture and air to protect food and maintain freshness. Easy to use. Simply add food to bag, insert open end into vacuum seal system, and machine will do 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 above package content, other products are not included. Note: Light and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.