1. 35cm RDM mast extension, which can be used on different sails 2. Easy to install and remove. 3.Made from plastic injection moulds and hardware press moulds 4. Best materials used. Nylon + Stainless steel 316 5.No rusty problem under normal use. 6. Black in stock; Other colors can be made according to customers' request. 7. 6061-T8 aluminum alloy tube.