Janome Freemotion Quilting Foot. 
 
Compatible machines:-
MC11000 / MC7700QCP / MC6600P / MC6700P
 
This new style free-motion foot has been designed to ensure that only minimum pressure is applied to the fabric at the moment the needle penetrates resulting in improved stitch quality. Its simple design means that a quieter more stable movement as no lever is placed over the needle clamp screw as with the standard type free motion foot. Movement is linked solely with the presser foot bar, resulting in quieter operation at higher speeds.
Part no. 200442004
 
Please check your manual or machine to correctly identify your machines model number - or contact the team for any help of advise.