The Seldén deck swivel articulates to follow the movements of the trimmer. Used for mainsheets on keelboats and smaller yachts. Can also be used on bigger boats if the purchase system is sufficient. The materials used are composite and stainless steel.
The Seldén mast swivel leads the line with full articulation towards the trimmer. It is mainly used for cunningham, spinnakers etc. The sheave has two optional positions, either for lines coming from above or from below.