I present to you our newest mod: Fabric Vertical Slabs.
As the title says, this mod adds Vertical Slabs, which can even be waterlogged!
You can craft these by simply putting a vanilla slab into a crafting table and it also works vice-versa!
The slabs also use the vanilla model, so this mod should be compatible with every resourcepack!
You can do anything you want with this mod except for making money out of it.