1.PE film or Kraft paper - keep air/water/humid away,thus rust-proofing. 2.Bubble Wrap - 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 Wooden crates - provide superior protection & stack ability.