SQ10B Large embroidery hoop measures 3.9" x 3.9" (100mmx100mm) This Generic Hoop is the Same As the Janome Part model #864438003 This hoop will work with the Janome Memory Craft MC550ELE MC550E MC500ELE MC500E MC450E MC400E The SQ10b Hoop is an optional hoop exclusively for Memory Craft 550E, 500E, 450E and 400E including “Limited Edition” models. This hoop is ideal for common daily use designs such as petite emblems or monograms up to 100 x 100 mm. You will need to update your machine in order to use this hoop.