Who Makes Those Square Green Plastic 'Drip Plates' That Kind of Looks Like a Cheese Grater?

I've seen them in photos and I actually saw them in person today while at the local grow shop. Unfortunately, I never thought to make note of the manufacturer's name. An image search is giving me no results. Hopefully someone here knows what I'm talking about and can point me in the right direction. Thanks!

from Hydroponics / Aeroponics
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