This is absolutely gorgeous, a proper luxurious ball of yarn.
150g/510m of 29% cotton, 25% alpaca, 25% wool, 21% polyamide. Oh, it's machine washable too!
Katia call it a "laceweight" but it's not that fine, more like a heavy 4ply or light DK - they suggest using a 3.5mm/4mm crochet hook and from 4.5mm to 6mm knitting needles, depending on the drape you require and what stitch you are doing.
Each ball comes with a free pattern for a crocheted or knitted shawl, each of which take just one ball each. Don't keep it just for those one-ball projects though, it would (subject to swatching) make a fabulous jumper or t-shirt :-)
(Note, the needles and hook shown in the photo are not included but we do sell them separately).