These X-Rings provide a low-drag shock seal for the shock absorbers on your ARRMA vehicleFeatures: Precision manufactured for consistent fit Manufactured from silicone material for compatibility with silicone-oil filled damper units X-shape cross section provides optimal sealing with minimal drag for silky-smooth shock action Designed to be used with ARA330729 Machined Shock Seal Guides  Includes:8 x X-Ring 4 x 7.5mmRequires:To be used in conjunction with #ARA330729