Stackable twist lock containers measure 4cm tall x 4cm wide (at the base). Hold 40ml. Made from BPA free plastic. Containers are food and microwave safe. These smart stackable containers can be used in a number of handy and practical ways: -Store dips, sauces and other condiments in your fridge -Organise all your different herbs and spices -Pack nuts, sultanas, yoghurt and other snacks for your busy on-the-go lifestyle -Store beads, paints, art and craft supplies and so much more! These genius plastic jars include clever interlocking screw-top lids to stack and lock the containers in a tower so they take up less space in your cupboard!