A great universal wok with stainless steel exterior and revolutionary CeraProtect mineral-based non-stick hard seal on cooking surface. Coating is PTFE free, Ultra-hard, abrasion-resistant, heat resistant up to 400Â°C. The best heat conduction and retention, saves time and energy. Extra strong Silitherm universal base,Â suitable for all types of hob. Ideal for larger portions and amounts of liquid.