1.Standard: EN397 CE 2.Material: HDPE 3.Advantages: Light weight, Good strength, Good toughness Standard: EN397 CEMaterial: HDPE Light weight, Good strength, Good toughnessProtecting ability: Anti-puncture, Anti-shockAdjust manner: A: plug, B: ratchet, C: auto-lockingFix head suspension: 8 pointTerm of use: one yearWeight: (shell weight + head suspension weight)A: 292g + 79gB: 292g + 90gC: 292g + ...