This fabulous nudibranch (sea slug) goes by the name Chromodoris magnifica. They are shell-less marine molluscs and clearly every bit as magnificent as their name suggests, within the limits of their approximately 6cm size(!)
It's a superwash treated 4ply sock yarn that's soft and smooth with 75% merino wool for softness and warmth and 25% nylon for strength and durability. It is suitable for approximately 2-3mm needles. About 420 metres per 100g skein.
This yarn is presented as a skein. If you would like it caked then this adds 24h to the dispatch time and costs £2. You can purchase this service here: