Yes, it is how thick the needle is. The one is 0.25 millimeter thinner than the other one.
My size chart lists both sizes (in mm) under US Size 1.
If the pattern calls for US Size 1, you can use either one, and I would go for the 2.5 mm.
Yes, it is how thick the needle is. The one is 0.25 millimeter thinner than the other one.
My size chart lists both sizes (in mm) under US Size 1.
If the pattern calls for US Size 1, you can use either one, and I would go for the 2.5 mm.