Spinrite-Mega Bulky Yarn. The perfect super bulky yarn for your knitting and crocheting projects! Weight category: 6. Content: 100% Acrylic. Putup: 10.5oz/300g, 64yd/58m. Gauge: 5sx7r = 4in/10cm on size US35/19mm knitting needles. Suggested crochet hook size USs/19mm. Dyelotted: we try but are not always able to match dyelots. Care: hand wash, dry flat, do not bleach, do not iron, do not dry clean. Comes in a variety of colors. Each sold separately. Imported.