An R&M silicone hot chocolate bomb candy mold (SKU 9008). Official page lists it BPA-free and food safe, -40°F to 445°F (-40 to 230°C), and oven, microwave, freezer, and dishwasher safe. Official tray size 12.25" × 6.75" × 1.125". Specs from R&M International (morethanbaking.com).
The silicone bomb mold we keep with the candy tools.