Heavy duty, high quality suction cup, fixes small to medium stained glass to smooth, clean and dry windows.
Instructions for safe use: ensure your windows are scrupulously clean and affix totally dry.
 
If conditions aren't totally perfect suction cups can fail.
I recommend that you check them regularly and remove, clean all surfaces and re-affix every 6 months and every time extreme weather occurs!
 
You may need to order these for smaller suncatchers as they only come as standard with small/medium stained glass pieces. (check descriptions to be see if included or not.)