...it is hard to imagine 110 slide film...
... if you have a limited knowledge of photographic history from the 1970's...
Kodak introduced 110 Pocket Instamatic camreras with color negative (Kodacolor II), color slide (Ektachrome-X and Kodachrome-X), and B&W (Verichrome Pan). Initially, the slide films were mounted in 30x30mm mounts rather than the 2x2" mounts used for 35mm, 126, and 127 Super Slides. Adapters were sold for allowing the small 30x30mm mounts to be used in 2x2" slide projectors and viewers. There was a series of Kodak Pocket Carousel projectors marketed as part of the original product line.
Later, the Pocket Carousel projectors faded from the market and Kodak's labs began offering 2x2 mounts as an option. Later the 2x2 became standard and the 30x30mm mounts vanished.
110 slides in 2x2 mounts and those in 30x30 mounts if inserted into the adapters can be scanned in conventional film scanners configured for 35mm. Depending on the scanning software, some manual adjustment may be necessary if the software doesn't auto-sense the smaller image area.