Someone else asked about the mold size. The medium ones are pendant sized and the small ones are charm sized or bracelet sized.
Another asked about extra resin left on the doming tray. I have not ever had soft or liquid resin left on the doming trays. The resin will harden and just use a paper clip or something to take a section of resin off, if needed. I will just throw that out in the garbage. Little Windows resins is non-toxic. When I wash my hands or wash my stuff out, I use dish washing liquid and wash it in my kitchen sink with some pretty warm/hot water. I don't have any resin left-over. I always use it all. I will always find something to pour the resin into even if it's a bottle cap.
Hope that answers everyone's questions. Let me know if that does not.