This is a set of 9 short Aerogarden Replacement Pods.You will be able to use your own growing medium such as Rockwool, Oasis Cube, Expanded Clay, Coco Chips, Perlite, Vermiculite or Rock. This is a great option to be able to customize your growing experience. This is 3D printed in PLA which is a biodegradable food safe material.These short pods are approximately 50 mm long or about 2 inches They fit perfectly in the corners of your AerogardenCheck out all of our other Aerogarden supplies on our Etsy store. We have many things including replacement pods, jar growing systems and growing cages.***** If you have any questions about Aerogardens, Kratky or Hydroponics please join our support group *****