We offer discount for large quantity. Welcome to contact with us! Hydraulic lock (manual control and remote lock). Shoulder Cap: Forged 6061 Aluminum Alloy.Steering column tube: straight and tapered aluminum alloy. Fork Leg Tube: Magnesium Alloy (Quick Release Axle, Plastic Bushing). Pillar tube: 6061 aluminum alloy, anodized surface treatment. Specifications (wheel size: 26/27.5/29 inches). Shoulder Cap Center Distance: 130mm. Brake disc: 160mm disc, 180-203mm disc (requires an adapter). 1.1 x MTB Air Fork.