From Vintage Blades:
Grade 4 - Super Silvertip Badger or "Super": Silvertip is hair that is picked only from the back of the badger. It is the softest of the hairs on the badger’s body. It gets its name from the characteristic light gray, or "silver" tips rising from the distinctive dark band on the hair. The Super Silvertip, or "Super", is re-dressed, or re-sorted silvertip that is re-graded in England. Any short or twisted hairs are removed, leaving the hair feeling softer and giving the brush a lighter appearance.
Bespoke... that's british for "Hand over your money, Sir!"