diff --git a/Settings.ui b/Settings.ui
index fb17bb6..bc94bf9 100644
--- a/Settings.ui
+++ b/Settings.ui
@@ -775,6 +775,8 @@
                             <property name="round_digits">0</property>
                             <property name="digits">0</property>
                             <property name="value_pos">right</property>
+                            <signal name="format-value" handler="tray_size_scale_format_value_cb" swapped="no"/>
+                            <signal name="value-changed" handler="tray_size_scale_value_changed_cb" swapped="no"/>
                           </object>
                           <packing>
                             <property name="left_attach">1</property>
@@ -803,7 +805,9 @@
                             <property name="adjustment">leftbox_size_adjustment</property>
                             <property name="round_digits">0</property>
                             <property name="digits">0</property>
-                            <property name="value_pos">right</property>
+                            <property name="value_pos">right</property>                            
+                            <signal name="format-value" handler="leftbox_size_scale_format_value_cb" swapped="no"/>
+                            <signal name="value-changed" handler="leftbox_size_scale_value_changed_cb" swapped="no"/>
                           </object>
                           <packing>
                             <property name="left_attach">1</property>
diff --git a/extension.js b/extension.js
index 9b0bd38..2b4c293 100644
--- a/extension.js
+++ b/extension.js
@@ -82,6 +82,8 @@ function enable() {
     MonitorsChangedListener = global.screen.connect("monitors-changed", setPanelStyle);
     HeightNotifyListener = PanelBox.connect("notify::height", setPanelStyle);
     setPanelStyle();
+    setTraySize(settings.get_int('tray-size'));
+    setLeftBoxSize(settings.get_int('tray-size'));
     Main.panel.actor.add_style_class_name("popup-menu");
 
     // Since Gnome 3.8 dragging an app without having opened the overview before cause the attemp to
@@ -141,6 +143,8 @@ function disable() {
     PanelBox.set_anchor_point(0, 0);
     Main.overview._overview.remove_child(myPanelGhost);
     Main.overview._panelGhost.set_height(oldPanelHeight);
+    setTraySize(0);
+    setLeftBoxSize(0);
     Main.panel.actor.remove_style_class_name("popup-menu");
 
     // dereference
@@ -169,6 +173,15 @@ function setPanelStyle() {
         PanelBox.set_anchor_point(0,(-1)*(Main.layoutManager.primaryMonitor.height-PanelBox.height));
 }
 
+function setTraySize(size) {
+    size ? panel._centerBox.set_style("font-size: " + size + "px;") : panel._centerBox.set_style("");
+    size ? panel._rightBox.set_style("font-size: " + size + "px;") : panel._rightBox.set_style("");    
+}
+
+function setLeftBoxSize(size) {
+    size ? panel._leftBox.set_style("font-size: " + size + "px;") : panel._leftBox.set_style("");
+}
+
 function bindSettingsChanges() {
     settings.connect('changed::panel-position', function() {
         setPanelStyle();
@@ -177,6 +190,14 @@ function bindSettingsChanges() {
     settings.connect('changed::panel-size', function() {
         setPanelStyle();
     });
+
+    settings.connect('changed::tray-size', function() {
+        setTraySize(settings.get_int('tray-size'));
+    });
+
+    settings.connect('changed::leftbox-size', function() {
+        setLeftBoxSize(settings.get_int('leftbox-size'));
+    });
 }
 
 function allocate(actor, box, flags) {
diff --git a/prefs.js b/prefs.js
index b155c6a..4b52aea 100644
--- a/prefs.js
+++ b/prefs.js
@@ -248,6 +248,38 @@ const Settings = new Lang.Class({
                 this._panel_size_timeout = 0;
                 return GLib.SOURCE_REMOVE;
             }));
+        },
+
+        tray_size_scale_format_value_cb: function(scale, value) {
+            return value+ ' px';
+        },
+
+        tray_size_scale_value_changed_cb: function(scale) {
+            // Avoid settings the size consinuosly
+            if (this._panel_size_timeout > 0)
+                Mainloop.source_remove(this._panel_size_timeout);
+
+            this._panel_size_timeout = Mainloop.timeout_add(SCALE_UPDATE_TIMEOUT, Lang.bind(this, function() {
+                this._settings.set_int('tray-size', scale.get_value());
+                this._panel_size_timeout = 0;
+                return GLib.SOURCE_REMOVE;
+            }));
+        },
+
+        leftbox_size_scale_format_value_cb: function(scale, value) {
+            return value+ ' px';
+        },
+
+        leftbox_size_scale_value_changed_cb: function(scale) {
+            // Avoid settings the size consinuosly
+            if (this._panel_size_timeout > 0)
+                Mainloop.source_remove(this._panel_size_timeout);
+
+            this._panel_size_timeout = Mainloop.timeout_add(SCALE_UPDATE_TIMEOUT, Lang.bind(this, function() {
+                this._settings.set_int('leftbox-size', scale.get_value());
+                this._panel_size_timeout = 0;
+                return GLib.SOURCE_REMOVE;
+            }));
         }
     }
 });