The inside dimension of this hoop is 6 1/4x 8 1/4″ (6.25×8.25″, or 158x209mm)
Actual sewing area depends on brand of machine between to 5 1/2″ to 7 1/2″ (5.46×7.46″ or 138 x 189mm)
Mighty Hoop has a diverse selection of sizes and matches perfectly with Smartstitch embroidery machines.
Youtube video on adding custom frames to the S-1201:
Youtube video on adding custom frames to the S-1501:
Youtube video on separate and keep your Mighty Hoop:
