Via Topps.com:

Topps is going right to the source.  With the release of 2017 Topps Star Wars Masterwork next week, Topps is introducing a new type of relic – Source Fabric Material.

These relic cards will feature a jumbo-sized raw material swatch sourced from the fabric used to create a Star Wars character’s costume. 2017 Topps Star Wars Masterwork will debut eight different Source Fabric Swatch relic cards with characters from Star Wars: The Force Awakens and Rogue One: A Star Wars Story.

The checklist includes:
Rey’s Tunic (The Force Awakens)
Rey’s Outer Garment (The Force Awakens)
Admiral Ackbar (The Force Awakens)
General Hux (The Force Awakens)
Admiral Statura (The Force Awakens)
Galen Erso (Rogue One)
Bodhi Rook (Rogue One)
General Merrick (Rogue One)

The Source Material Swatch relic cards will be inserted as redemptions and bonus hits on top of the four hits per 2017 Topps Star Wars Masterwork master box that are already guaranteed.

Topps Star Wars Masterwork comes out on November 8, exclusively in hobby shops. Each master box contains four mini boxes with one hit in each mini box such as autographs, sketch cards, filmstrips, animation cels, and medallion cards.