The Slabs are recolored, slightly altered versions of the Stone Slab. So they do bear some resemblance, lol. I'm not a great spriter, and the slabs do look a bit off. They're just my best attempt to fulfill a request I received. I may try to improve them during some down time. The Conveyor and Express Conveyor don't have recipes, but the Creeping Conveyor does. This is because the Creeping Conveyor was ported from MiraiMai's Never Enough Devices and I kept her original recipe in place. The Conveyor and Express Conveyor were my creations and I'm not so good at coming up with recipes. It's usually one of the last things I do, or gets done once someone suggests a recipe I like. Having the Wet Debuff applied when the Wet Rain option is set to false is a bug. I have fixed it and uploaded the new version. Thanks for the bug report and the comments!