The aluminum spars consist of 2 pieces for the mast that slot in together, and the boom. The size of the spars varies depending on which rig you have (full, radial or 4.7).
They are designed to bend (to give the sail the shape you want) when the vang, cunningham, outhaul and mainsheet ropes are pulled on. This allows the sail to be tuned (give the sail more twist or flatten it out) depending on the angle of breeze, and how hard the wind is blowing.
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Thanks to the site owner. 😀
Great to see that you’ve found the site useful. Good luck with your Laser sailing.