I got these to put on a cake that I made as a surprise. It was a wrestling ring cake and these were supposed to be behind a wrestling figure, at various heights and all lit at the same time. They were very hard to light! I had to hold the lighter on it for about 15 seconds and they burn very quickly so not all of them were lit when the person was brought in to see the cake.
Other than that they are a nice size and the tube they come in is great. They are VERY sparkly, low smoke and are indeed good for indoor use. Just have several people help you light them if you want them all lit at the same time and use a long lighter so you don't burn yourself!