Size details: the size of resin mould is approx. 21 x 15 cm/ 8.3 x 5.9 inches, which can meet your various making. Don't use a heat gun to speedily cure the resin, It may damage the moulds. Just let it sit 5-8 minutes after stirring the epoxy resin to reduce the bubbles. Please store your resin moulds in room temperature place, avoid from the direct sunlight.