... antioxidant,shockproof ,damp-proof. 2. OEM high quality lightweight aluminum briefcase : Item OEM high quality lightweight aluminum briefcasePanel TypeAluminum plateInsert material ... available:EVA,sponge,velvet,flocked fabric,ash rubber Lock type available:number lock,key lock, ... available:Round coner,straight coner Handle type available:Rubber handle,metal handle Please advise material,thickness, ...