Knóbz Vol.4 contains particles of GUI for applications and web sites. Contains full vector Photoshop layers merged into good named layer groups. Threre’re both two versions: for regular desktop apps and for Retina/HDPI apps. Inside kit: knobs, sliders, switches, bars on light gray background with blue lights. Also contains some useful things like embossed borders and hidden bonus. Good for audio software and sound widgets.