The GLI Hurricane Solar Reel System is manufactured from high quality commercial grade structural aluminum for the easiest and most durable reel system. The GLI Hurricane is engineered with sealed, high-strength nylon bearings for effortless one-person operation. Base kit includes all straps and required hardware for attaching the solar blanket. Optional locking casters available for easy roll away storage. Super strong anodized aluminum tube kits are pre-drilled for easy installation and assembly and are available in a variety of different sizes for pools of all sizes. The appropriate tube kit must be purchased separately. It is recommended to use a 4″ tube kit for pools that are 600 square feet and larger, or when using thicker mil solar blankets (10 or 12 mil).