These are a heavy duty plastic product that which is great, except I was hoping for sticky backed vinyl. The application of these are difficult b/c of the material. They have a putty type putty product that you must apply to each star. Makes it time consuming when you are trying to cover an entire ceiling. I will say that it will not damage your walls when removed (or so it seems). A ceiling application is tricky b/c it does not seem to be getting enough light to "charge" the glow in the dark feature. So my kids just shine a flashlight on the ceiling for a few minutes when getting ready for bed.
If you have a light filled room and/or applying to a wall where ceiling lights can shine down on you should be ok. There is a ton of variety in this pack. Different sizes and solar system pieces if you are wanting that~
I was looking for a game to play when waiting for my truck in the shop or waiting during a doctors appointment. I see people playing on their phones draining the battery down and I can play all day not worrying about charging it.
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