This part does NOT come with installation instructions! This black rubber Winding Belt is near the Winding Arm Assembly and the Flywheel Assembly - this belt is specifically for the following Panasonic Devices: SAAK14, SA-AK14, SAAK323, SA-AK323, SAAK330, SA-AK330 This is a true Panasonic Part. This offering is for ONE Belt! If you are unsure if this is the correct belt for your unit, please send us a message so we can help you select the correct belt!