Our clear polycarbonate tealight cups and votive cups are flame retardant. They are in various shapes: round, square, star, heart, sea star, strawberry, apple, moon, bear, butterfly, etc. Our aluminum tealight cups are usually made of aluminum sheet, which is 0.07-0.08 mm thick. However, if clients need, the sheet thickness can be 0.12 mm. We have cups for tealights of 7 g, 10 g, 12 g, 13 g, 14 g, 16 g, 17 g, 20 g, 23 g, 36 g, etc. You are welcome to visit www.supercandle.com for a look at our different types of tealight cups.