Brittany Birch Double Points. Most people use the shorter (5) needles for socks! The other sizes are 7.5 long.
Knitter's Pride Zing Double Pointed Needles and Jimmy Beans Wool Jimmy's SmartStix Double Pointed Needles are both similar needles: double point and US 9 (5.5mm) US size.
You may enjoy taking a look at the Blue Sky Fibers Bulky Cardiff Coat, Blue Sky Fibers Bulky Baby Hat , and Rowan Big Wool Cardigan Bay Jacket kits all using Brittany Double Point Needles.