The all-composite T2 is the first block with no metal shackles or rivets to corrode: the lightest Harken soft-attach block ever. High-strength sideplates have no metal fasteners. Soft attachments reduce weight and noise, allowing the block to articulate to align with the load. The T2 Loop requires no knots, splices, or tools to install, sliding easily through the block head and over the anchor post for a secure connection. An SK-75 Dyneema loop is included. The T2 includes a length of covered Spectra line, and can be tied, spliced, or lashed to almost anything. Both models route the attachment line through the block head and sheave, reducing load on the sideplates and acting as a safety backup for your system.Sheave: Fiber-reinforced high-strength nylonBall Bearings: Carbon-black Delrin ball bearingsCheek Material/Finish: Fiber-reinforced high-strength nylonShackle/Strap Type: SK-75 Dyneema loop (T2 Loop Blocks); piece of covered Spectra line (T2 Blocks)