Driftwood Interchangeable Set- 9cm/3.5" TipsMade of strong birch wood, the Lykke Driftwood needles are very smooth and light. With their warm character, the Driftwood needles are easy on the hands and the eyes a true pleasure to work with. All Lykke needles have both metric and US sizes etched on the needles to ensure long term readability. Set contains: 9 pairs of 9 cm 3. 5" needle tips: 3. 25 mm, 3. 5 mm, 3. 75 mm, 4 mm, 4. 5 mm, 5 mm, 5. 5 mm, 6 mm, 6. 5 mm (US 3, 4, 5, 6, 7, 8, 9, 10, 10.