font-face not working

Is there anything wrong with this font-face code that is not changing the font of my webpage? I installed all the font files in the ‘fonts’ folder of my theme folder.

@font-face {
font-family: ‘roboto_slabregular’;
src: url(‘fonts/robotoslab-regular-webfont.eot’);
src: url(‘fonts/robotoslab-regular-webfont.eot?#iefix’) format(’embedded-opentype’),
url(‘fonts/robotoslab-regular-webfont.woff2’) format(‘woff2’),
url(‘fonts/robotoslab-regular-webfont.woff’) format(‘woff’),
url(‘fonts/robotoslab-regular-webfont.ttf’) format(‘truetype’),
url(‘fonts/robotoslab-regular-webfont.svg#roboto_slabregular’) format(‘svg’);
font-weight: normal;
font-style: normal;

}

I declared this code on my style.css sheet…and i changed all the font family to the declared name but it still does not work. Is there anything I can do???