From the La Bien Aimée website:
La Bien Aimée Merino Singles is a soft single-ply superwash merino with a beautiful twist. This yarn takes color beautifully and has a crisp stitch definition.
Composition: 100% superwash Merino
Care: Hand wash recommended
Weight: 100g, Fingering weight
Meterage: 366m (400yds)
Needles: 2.5mm-3.5mm