Steel crochet hook size 8 or 9.

Gauge: Each block measures about 5-1/2 inches when blocked.

Finished Sizes:
Single Size Spread: 72-1/2 x 105 inches (280 blocks in a 14 x 20 arrangement)
Double Size Spread: 89-1/4 x 105 inches (340 blocks in a 17 x 20 arrangement)

Single Size Requirements:

• Sky-tone: 51 balls
• Frost-tone: 21 cones
• 18th century: 21 skeins

Double Size Requirements:

• Sky-tone: 62 balls
• Frost-tone: 26 cones
• 18th century: 26 skeins