Thank you for viewing. This is a set of 100 disposable mixing cups for resin. Personally, I find it troublesome to clean the mixing cups every time, so I use these inexpensive disposable ones. I put a small amount of colorant on the handle part and gradually mix it into the resin to color it to my liking. It also has a spout, making it easy to pour into fine details. I think it's better not to use an embossing heater as it can warp the resin. Air bubbles will naturally disappear if left for a while.