Lego Technic Axle 6 Mindstorms 3706 Black x6 | eBay
LEGO® 3706 - Technic, Technic as 6L - Steentjeswereld
Amazon.com: LEGO TECHNIC 100 pcs BLACK AXLE SIZE 6 STUDS STUD LENGTH Cross Rod Mindstorms robot motor short medium part piece 3706 NXT ev3 robotics : Toys & Games