Popular tunable inductor from Toko with ferrite hexagonal core. In a white plastic former with nominal inductance of 30nH. Cores can be interchanged between two types or ferrite and aluminium so inductance can be varied over a large range.
This coils is supplied with an aluminium core- ferrite can be supplied on request.
These are now long obsolete, and we stock either original parts or an equivalent (which are identical in size and performance).