You will find a few different types of cannelés molds on the market: - Copper: the most traditional ones, usually sold in individual cannele molds. They will give you the crispiest, most caramelised exterior but have a rather high cost - so they are not the most accessible. They also need to be seasoned with beeswax. - Metal (Aluminium) Pan: the best alternative to copper molds, without the high price. They will give you a nice caramelised exterior as well and don't required to be seasoned with beeswax. - Silicone: the cheapest option (and usually the easiest one to find around), but I personally find that it does not give the same crispiness to the canneles as the heat won't travel through silicone mould the way it does through metal. I personally use this Metal Cannele Mold that is the best compromise between price and good results.