A strop in sailing is a loop, strap, or grommet of rope, webbing, or metal used to secure, support, or connect components, such as attaching blocks to spars, securing sails, or handling cargo. Strops provide a flexible, strong, and protective alternative to metal shackles, preventing damage to masts or decks.

Key Details About Strops:
Purpose: They are used as versatile, high-strength rigging connectors, often referred to as "soft shackles" or mooring strops when made of synthetic rope.

Application: Strops secure sails (e.g., at the clew) or fasten blocks to spars.

Material: Traditionally made of hemp or wire, modern strops are commonly made of high-performance materials like Dyneema for strength and reduced chafe.

Nautical Origin: Stemming from 14th-century usage, the term refers specifically to a short, strong loop used in rigging.

Adjustment: In racing, strops are often used for precise adjustments, such as centering a boom, and must be carefully sized.