Panel Material: 25 mm Biomass macwood panel Keel Material: BPC keel structure (waterproof / moisture-proof / anti-corrosion / moth proof) Noise reduction membrane layer: Made of EVA Force reduction (Area Elastic): 61% Vertical deformation (Area Elastic): 2.7 mm Ball rebound: 95% Slip resistance: 100 Rolling Load: 0.30 mm Lifespan: Indoor 30+ years / Outdoor 15+ years