We pack 20 pieces HBAN Metal lNO1NC/2NO2NC 19mm 5A/250VAC IP40&IP65 Waterproof mushroom emergency stop switch into 1 foam box to protect them .We supply 20 pieces rubber rings.Then we packed this foam box into a plastic bag,it will packed into a small box with 3 layers corrugated .Finally ,we packed 20 boxes into a 5 layers corrugated export carton.