I leave mine on the blinds. Vinyl blinds are light weight, and the added weight helps them to drop when I let them down. Also, they can break if bent, which my cats did when trying to look out at the birds in the morning before I got up, so there was no hunting for spares to repair them. BTW, repairing and restringing them is not rocket science, just requires a little study and patience, so don't throw them out if the string breaks or the webs tear.