This is the real magic. As you pull the handle upwards our rolling O-ring releases the air-tight seal and lets the plunger rise effortlessly. Decant up to 250g of fresh beans or grounds. Forget fussy clips or fold-overs, just recycle the bag and admire the look of your coffee. Gently pushing down the plunger expels the air, seals the jar and keeps the contents fresh for longer. With a very satisfying hiss. Try not to play with it all day. Zero jars come in pairs, so you can juggle wake-up and after-dinner coffee variants and keep them both fresh. ROK Zero Jar Features Keeps air out - The plunger lid expels air out of the jar as you push it down and keeps it out with a tight seal. Easy to open - For an airtight container, the Zero Jar opens easily, thanks to its pressure-releasing O-ring. Set of two - The ROK Zero Jar comes as a set of two. This Product Includes: 2 x ROK Zero Jar The Specifics Materials Glass jar, silicone base and O-ring, glass composite plunger Capacity 600ml | 200g Beans Dimensions (H) 11cm x (Dia) 10cm