Aunt Lydia's Crochet Thread Size 10 Aunt Lydia's Crochet Thread Size 10. This high luster mercerized cotton crochet thread is perfect for crochet projects both large and small. This thread is available in a wide range of fashion solids, neutral basics and alluring multi-colors that are ideal for home decorating and fashion projects. Article 154 is a size 10, bedspread weight, 3ply 100% mercerized cotton thread. Features: Yarn Weight: Size 0 Crochet Thread weight: 10 White, Ecru & Natural: 400 yards Solids: 350 yards Shaded colors: 300 yards Material: 100% Mercerized Cotton Bedspread Weight Available in a variety of colors. Each sold separately. Imported. Care: machine wash (max temp. 104F/40C), dry flat, do not bleach, do not dry clean, OK to iron. Dyelotted: we try but are not always able to match dyelots.