The inside dimension of this hoop is 9 x 4 1/4” (8.875“ x 4.25 ”, or 225mm x 108mm) Actual sewing area depends on brand of machine approximately 8 1/16″ x 3 1/2″ (8.08” x 3.46″ (205mm x 88mm)
I have purchased 3 different sizes of the mighty hoops. They are by far my favorite hoops to use on my Brother Persona PRS100! I use them for different types of material, shirts, jackets and blankets.