Magic Cook Triple Layers Lunch Box with 11 Refill Heat Packs of (50g) Double Layer High Heat Resistant PC with Stainless Steel Inner Compartment Imported Double layer high heat resistant PC with stainless steel inner compartment Traveling lunch box cooker with options to heat up Anytime, anywhere without the need of fire, gas and electricity Water activate heat source reaches up to 203 F degree Materials container: stainless & double layers high grade heat resistant PC Includes 11 large Refill heat packs Made of highest grade heat resistant food grade double layers PC and S304 stainless steel inner compartment. Place 1 Magic heat pack into the PC compartment and pour suggested water line Place the stainless steel back into the PC compartment and wait for the 1st reaction then close and lock lid. Wait 5-15 minuets as cooking time may vary