This is the factory standard rudder blade part # 20491000 White NYLON , These are predrilled with indents. Make sure you have the Ez lock rudder system with the plasic housings with fling H on them. See pictures for the proper blade and housing. There were some early waves and getaways that used the Hobie 16 blades which are different with metal housings. These are the current blades being used by Hobie.