The inside dimension of this hoop is 4×6” (102mm x 152mm)
Actual sewing area depends on brand of machine approximately 3.23 x 5.2” (82mm x 132mm)
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: