Petra is a mercerised thread from a 100% long staple cotton, lightly twisted for a soft and supple finish. Suitable for Knitting & Crocheting and is ideal for clothing & accessories, baby items & home decor. This is the same as the Cotton Perle hanks. 100% mercerised cotton. Crochet Hook size 1.75-2.00mm, Knitting Needle size 2.50mm, 100g approx 400m, Wash up to 60.