I use Blue Chip’s JD thumb picks for banjo and fingerpicking guitar. They fit well, sit tightly, sound great, and they last a long, long time. Having grown up using plastic thumb picks, having to shape them with boiling water and pliers because they are inconsistently made, and then having them eventually sound scratchy and wear out, I truly appreciate the Blue Chip thumb picks.
The TP-40 is my preferred pick for flat picking. Having used shell picks for years made from a jewelry box I bought in an antique store, I love the consistency of the Blue Chip flat picks. Unlike shell, no care is required. Unlike plastic, they really last, and the tone is vastly superior, very similar to the sound of shell.
I used the Blue Chip thumb pick and the Blue Chip flat pick exclusively on my new bluegrass instrumental record, Hogan’s House of Music. No jewelry boxes were harmed in the making of this album.
Ron Block of Alison Krauss & Union Station