BFF is a collaboration between Core Concept YoYos and SF Yoyos. Its H-profile 6061 aluminum body uses curved stainless-steel inner rims related to the SF SS design. The unresponsive model has a Center Trac C bearing and slim response pads.
Documentation notes
REWIND records 2018 and specifications of 57.32 mm diameter, 42.46 mm width and 65.7 g. Exact initial launch day and gap width remain unverified. The collector ledger’s January 3, 2018 date and 35 pieces concern the Unknown edition, not total model production. Core Concept #27456 and SF Yoyos #5198 are genuine co-brand collaborators. The attached REWIND photograph is a blue/silver splash example with a rainbow-colored inner rim; it is not identified as the Unknown edition.
