From the Brother website:

New to the Hoopnetic Series, the 5” x 7” Magnetic Flat Frame is lightweight and easy to use.

With six strong magnets, you can hoop and embroider materials up to 2MM in thickness.

This hoop comes with six magnets.

• Compatible Machines The Magnetic Flat Frame will work with the following machines: NQ Series (NQ3700D, NQ1700E, NQ3600D, NQ1600E), Stellaire (XJ1, XE1) and Stellaire (XJ2/ XE2), Dream Machine (XV8500D, XV8550D), Luminaire (XP1, XP2, XP3), V Series, Essence (VM5200 and VE2300).