Interesting. I hadn't paid that much attention to my Oddity so I went outside and looked. Some are tubes and some are blades (open tubes). The bigger ones tend to be blades. I'll take a picture now and compare with later.
And it looks like I have one offset that has reverted to a regular looking semp. Maybe I'll separate that one and watch it rather than toss it into the common semp pile like I usually do.
