Needles:
3.25mm double pointed for average size
4mm double pointed for large size

Tension:
24 sts and 30 rows = 4 inches with 3.25mm needles in stocking st.
22 sts and 28 rows = 4 inches with 4mm needles in stocking st.

Sizes:
(width around palm of hand)
Average - 8 ins (20 cm)
Large - 10 ins (25 cm)