NOMADIC Black SY-1 Siisaa Collaboration Pen Case Secret Executive Pen Case New, Unopened Instant Purchase OK Size: W20.5 x H6 x D9.5 cm Body: Approximately 160g Main Material: PU Leather Color: Black This is the SY-01 Secret Executive Pen Case, a collaboration model with the stationery YouTuber "Siisaa" (594,000 subscribers as of April 11, 2023), a first in the industry. This is an executive-spec improvement of NOMADIC's 20-year-old classic pen case. This pen case is packed with Siisaa's attention to detail.