These trays are particularly suitable for growing micro-greens, I use them myself in my company and they can handle a beating. These are not the ‘buy cheap and throw away’ sorts, but are rather robust multiuse.
They are best suited for greenhouses or other places where water is allowed to run out, as there are no bottom trays for them. If you want to grow indoors I would recommend choosing a set with bottom trays – see HERE
The trays measure 30×60 cm (external dimensions)