You can make these creepy Halloween Skull decorations in three different sizes

They are knitted around ball pool balls and ping pong balls.
Small – 12.5 mm (ping pong/table tennis ball)
Medium – 17 mm (small ball pool ball, mine were from pound shops in net bags of 15.
Large – 20 mm (regular size ball pool ball which I have found in supermarkets and charity shops.)
They are a great way to recycle old toys
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The yardage includes all the yarn. The smallest skull takes approximately 4 grams (15 yards) Medium 6 grams (22 yards) and the large 8 grams (30 yards)