In Stock

4mm Robline Sirius 500 Line

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Current Stock:
4 mm
Line Type:
Polyester Double Braid

Frequently Bought Together:

4mm FSE Sirius 500 Line
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Ex. Tax


4mm Sirius 500 from Robline is a great low stretch yet affordable line for control lines, halyards, and other application on recreational sailboats. This is a double braid polyester line, meaning it has a 8-plait polyester core and a 32-plait polyester cover, and is known for its high breaking loads and minimal stretch. The line holds up very well in hardware such as cleats, making it a great option for many small boat and recreational cruising sailors.

  • Colors: Red, Blue
  • Diameter - 4mm (5/32 inch)
  • Other Available Diameters - 5mm
  • Core - 8 Plait 100% Polyester
  • Cover - 32 Plait 100% Polyester
  • Applications - Control Lines, Halyards
  • Features - Double Braid, Low Stretch
  • Average Strength - 1212 lbs
  • SOLD BY THE FOOT (Quantity 1 = 1 Foot. Adjust quantity to order longer lengths)


  • Stretch - Polyester offers relatively low stretch and acceptable for recreational applications
  • Material - 100% polyester for both cover and core
  • Splicing - This line is not recommended for splicing

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Shipping & Returns

Delivery Info: Enjoy Free Standard Shipping on most orders* to the Continental United States over $99. Our Standard Shipping method utilizes USPS, UPS, and FedEx to send packages near and far. Oversize/Freight shipping (where applicable), Expedited Shipping (where available), and rates to other destinations will be calculated at checkout.

See our Shipping Page for more information (and exceptions).

Returns Info: Your 100% satisfaction is our goal - we want you to love your sailing gear, but if something doesn't work out, we accept returns on most new, unused items*. Returns can be made within 366 days (1 year + 1 day) of your original order date. Exceptions include (and are not limited to) cut line, Rig Shop products, special order items, numbered sailors, and items used or worn sailing.

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