The length of the mitts is 8.7 inch / 22 cm. They are 5.5 inches / 14 cm wide and photographed on hands which measure 7.9 inch / 20 cm around.
What you need is four double pointed knitting needles number 4 (US 6) and about 110 yd / 100 m of pure wool.
The pattern is a PDF file that you can download directly after payment. It is available in English and in Dutch.