Rear bumpers for Bailey type 600 micro chassis. Made from .750 X .065 stainless steel tubing. WHEN ORDERING, BE SURE TO SELECT CORRECT TYPE FROM THE REAR BUMPER OPTIONS. ALL BUMPERS AND NERFS ARE PRECISION FIT AND ASSEMBLED IN JIGS THAT ARE SET TO STANDARD CHASSIS DIMENSIONS. IF YOU ARE UNSURE OR HAVE QUESTIONS ABOUT FIT, PLEASE CLICK ON THE "CONTACT US" LINK ABOVE AND WE WILL WORK WITH YOU TO MEET YOUR BUMPER AND NERF NEEDS.