You know this coaster for the windowsill. We usually have it made as a "tray" for a number of metal sowing frames, but now offer it separately, without the frames: Because what also fits inside are two of the inexpensive seeding boards made of wood fiber that you can also get from us (item number 67145). To them, the coaster then serves on the one hand as a water collection tray, on the other hand as a solid base and stabilization for transport .