Upgrade your MasterClass cast aluminium casserole pot with these handy finger protectors Simply slip these silicone handle grips over the side handles and knob of your casserole. When you lift, you’ll enjoy improved grip and protection from heat, thanks to their heat resistant silicone construction. MasterClass uses silicone that’s rated to LFGB standards, which are the most stringent standards in Europe. This means you can rely on these pinch mitts to be durable, and for good measure, they’re non toxic, water resistant and odour free, too.