In this paper, we construct a new class of Finsler metrics which are not always $(\alpha, \beta)$-metrics.
We obtain the spray coefficients and Cartan connection of these metrics. We have also found a necessary and sufficient condition for them to be projective.
Finally, under some suitable conditions, we obtain many new Douglas metrics from the given one.
Keywords: Finsler geometry; $(F,\beta)$-metric; $h$-vector; projective change; Douglas space.