TX "AP" Rev. 4 stabilizers, designed by Kin25. These stabilizers minimalize rattling and have wire pop-out prevention. Sets include - 4 2U - 1 6.25U (WK) and 7U (WKL) - 1 Pack of Stab Stoppers Currently available in - Black - 1.6T PCB (Normal Sizing) - 1.2T PCB Choose LP if you are using a long pole style mechanical switch Also two options for either regular or long pole version of the stabilizers. Long pole stabilizers are for having better compatibility with long pole switches.