These are so adorable! They come with two suction cups that she can adhere to glass which you can see in one of my photos is lightweight, and I don’t have any issues with the suction cup falling off of the window from my picture. She can see that I chose to hang one with a suction cup and one I used a small braid nail. The stained glass is just my favorite part and the clear test tubes don’t distract from the stained glass backdrop for the price point. This is very well constructed and I’m delighted that it had an option for suction cups. It is winter where I am located currently so I’m not sure how the suction cups will hold based on increasing heat of glass in the hotter months, but thus far I have no complaints. It looks very authentic for staying glass creations and at the perfect amount of ones and vintage charm. I’m absolutely thrilled!