THE INDEX SECTION
Refills & fit
Find the exact refill family before comparing price
BL77 and SXS15 use different manufacturer-listed refill families.
A cheaper refill is not a complete new pen
Compare replacement options only after the body and refill family are known.
Keep the body code when the first cartridge is empty
A small identity record makes a later refill lookup possible.
An unlisted body stays unverified in the refill finder
A narrow lookup is more useful when its boundary is visible.