We present the discovery of the widest ( \sim 6700 AU ) very low mass field binary to date , found in a proper motion cross-match of the Sloan Digital Sky Survey and the Two Micron All Sky Survey .
Our follow-up J-band imaging provides a 10-year baseline for measuring proper motions .
Consequently , we are able to confirm the common proper motion of the pair to within 10 mas , implying a 99.5 % probability of their physical association .
Near infrared spectra of the components indicate spectral types of M6 \pm 1 and M7 \pm 1 .
The system resides at a spectroscopic distance of 105 \pm 13 pc and has an angular separation of 63.38 \pm 0.05 \arcsec .
We have used evolutionary models to infer component masses of 0.105 ^ { +0.029 } _ { -0.017 } M _ { \odot } and 0.091 ^ { +0.010 } _ { -0.007 } M _ { \odot } .
The large separation and low binding energy of this system can provide constraints for formation models of very low mass stars .