This range of standard pre-made halyards has been designed to make replacing halyards on your sailing boat quick and simple. They come in three standard colours: grey, navy blue and red. This is a performance specification for a 1:1 main halyard made from Powersprint, from Italian rope makers Gottifredi Maffioli, with an SK78 Dyneema® core and durable polyester cover. At the cockpit end, it is finished with a Flemish eye (to simplify running halyards through the mast) and at the working end it has a covered eye splice plus a 6mm soft shackle, for connection to your mainsail. The choice between 10mm and 12mm diameter at this length will come down to the setup of your specific boat and will generally be dictated by your existing sheaves and halyard clutches This 12mm diameter x 35m long halyard is recommended for use on masts with a “P” measurement of between 12 – 14m. However, due to variations in cockpit setups, we suggest you double check the appropriate length for your own boat. We use the following formulae for 1:1 main halyard length: 2.1 * P + [distance from boom to deck] + [distance from mast to halyard winch] + 2m It is better to have a halyard 2-3m too long than too short!