Silicone Baking Mats Macaron Cookie Sheet - Set of 3, Non Stick Oven Tray Liners for Macaroons/Cake/Pizza/Bread Making,42x29.5cm, 29.2×21.6cm, by Super Kitchen(Grey). The silicone mat thickness all are 0.75 mm design, which is thicker than the 0.4mm on the market.
eBay