Hardware accessories are available for a variety of core types.   Bobbins, also known as coil formers, are available for most ferrite geometries in many types: plain bobbins, printed circuit bobbins (available pinned and unpinned),  and  surface mount bobbins.  Mounting clamps  (clips) are also available.  Toroid mounts, toroid headers, and toroid cups are available for mounting wound inductor, choke, or transformer coils.  Tuning assemblies, which consist of a trimmer base, trimmer screw assembly, washer and nut, are also available.