Vertical Slabs

Plenty of Blocks

Official listings describe a mechanic where slabs from this addon can be placed vertically (sideways), unlike vanilla horizontal-only slabs; a promotional screenshot is labeled '20 Vertical Slabs'. No source lists all 20 materials by name. Colors identified by viewing that screenshot: dirt, grass, several colored wood tones (orange, yellow, white/pale, magenta/pink, teal), plain gray stone, and moss-covered stone.

Sources

• Promotional screenshot (Chunk.gg)