Individual stiffener spacer to slide inside American or PT Star mast section for use when you are using a longer tube. Can be used with either aluminium or carbon. Just make sure mast is protected from the carbon tube otherwise corrosion will happen.
The pack includes 1x spacer, 1x black poly pipe sleeve and 1 rivet. Just order the number you need - recommend a spacer every 500-700mm.
(Stiffener Kit Installation Instructions can be found here)