A skiff is a somewhat small ship of average speed. It can fit more than a Dinghy.

(Picture is for reference only. It does not have to look like that.)

Minimum Block Count: 30
Maximum Block Count: 40
Minimum Percentage of Wood Planks/Slabs/Stairs/Trapdoors/Fences/Logs (Hull): 50%
Minimum Percentage of Wool/Banners (Sail): 40%
Blocks skipped when cruising: 4
Speed: 0.5