TinyMCE v 4 change font style / size / family

tinymce.init({
selector: 'textarea',
height: 350,
content_style: ".mce-content-body {font-size:13px;color: #607d8b;font-family:tahoma,verdana}",
menubar: false,
plugins: [
'advlist autolink lists link image charmap print preview anchor',
'searchreplace visualblocks code fullscreen',
'insertdatetime media table contextmenu paste code'
],
toolbar: 'undo redo | insert | styleselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link image'
});