The product KATSEYE - SIS (Soft is Strong) (Soft/Strong Ver.) includes the following contents:
- Cover
- Photo Book
- Envelope (Contents)
- Lenticular Card
- Photo Cards (2 out of 6) + Envelope
- Folded Poster
- Lyric Card Set (5 pieces)
- Sticker
- Polaroid
- Postcard Set (6 pieces)
- CD + Envelope
- Paper Keyring