1, PE film or Kraft paper in anti-rust oil - keep air/water/humid away, thus rust-proofing. 2, Bubble film - increases the impact resistance ability. 3, Rubber Slip or Corrugated Angle - gives special care to knife edges. 4, Wood Screws crates - makes opening easier without damaging the crates 5, Corrugated boxes or plywood case - provide superior protection and stack-ability