Woolcraft Pebble Chunky Yarn. Pebble Chunky is spun using 100% Acrylic and comes in a 200g ball. Pebble is a great price and will soon be your favourite with a wide range of gorgeous colours. Choose your favourite and start knitting those cosy garments and accessories! Shop the complete Woolcraft collection now, including Woolcraft Pebble Chunky Yarn and Earn Loyalty Reward Points on all purchases. FREE Delivery options also available.