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HTML 

              
                <button class="metal radial">✈</button>
<button class="metal linear">2</button>
<button class="metal linear">1</button>
<button class="metal linear">0</button>

<a href="http://simurai.com/lab/2011/08/21/brushed-metal/" class="metal linear oval" target="_blank">i</a>
!

CSS 

              
                /* globals */

@import url(https://fonts.googleapis.com/css?family=Droid+Sans:regular,bold);
@import url(prefixes.css);

html {
  font:62.5%/1 "Droid Sans", "Lucida Sans Unicode", "Lucida Grande", Verdana, Arial, Helvetica, sans-serif;
  background-color: hsla(0,0%,90%,1);  
  background-image: linear-gradient(-45deg, hsla(0,0%,0%,0), hsla(0,0%,0%,.05) );
  background-size: 5px;
}

body {
  margin: 100px;
}

button { border: none; display: block; }
a { text-decoration: none; display: block; }



/* Metal ------------------------- */

.metal {
  position: relative;
  margin: 40px auto;
  outline: none;
  
  font: bold 6em/2em "Helvetica Neue", Arial, Helvetica, Geneva, sans-serif;
  text-align: center;
  color: hsla(0,0%,20%,1);
  text-shadow: hsla(0,0%,40%,.5) 0 -1px 0, hsla(0,0%,100%,.6) 0 2px 1px;
  
  background-color: hsl(0,0%,90%);
  box-shadow: inset hsla(0,0%,15%,  1) 0  0px 0px 4px, /* border */
    inset hsla(0,0%,15%, .8) 0 -1px 5px 4px, /* soft SD */
    inset hsla(0,0%,0%, .25) 0 -1px 0px 7px, /* bottom SD */
    inset hsla(0,0%,100%,.7) 0  2px 1px 7px, /* top HL */
    
    hsla(0,0%, 0%,.15) 0 -5px 6px 4px, /* outer SD */
    hsla(0,0%,100%,.5) 0  5px 6px 4px; /* outer HL */ 
  
  transition: color .2s;
}



/* Radial ------------------------- */

.radial.metal {
  width: 160px;
  height: 160px;
  line-height: 160px;
  border-radius: 80px;
  background-image: -webkit-radial-gradient(  50%   0%,  8% 50%, hsla(0,0%,100%,.5) 0%, hsla(0,0%,100%,0) 100%),
    -webkit-radial-gradient(  50% 100%, 12% 50%, hsla(0,0%,100%,.6) 0%, hsla(0,0%,100%,0) 100%),
    -webkit-radial-gradient(   0%  50%, 50%  7%, hsla(0,0%,100%,.5) 0%, hsla(0,0%,100%,0) 100%),
    -webkit-radial-gradient( 100%  50%, 50%  5%, hsla(0,0%,100%,.5) 0%, hsla(0,0%,100%,0) 100%),
    
    -webkit-repeating-radial-gradient( 50% 50%, 100% 100%, hsla(0,0%,  0%,0) 0%, hsla(0,0%,  0%,0)   3%, hsla(0,0%,  0%,.1) 3.5%),
    -webkit-repeating-radial-gradient( 50% 50%, 100% 100%, hsla(0,0%,100%,0) 0%, hsla(0,0%,100%,0)   6%, hsla(0,0%,100%,.1) 7.5%),
    -webkit-repeating-radial-gradient( 50% 50%, 100% 100%, hsla(0,0%,100%,0) 0%, hsla(0,0%,100%,0) 1.2%, hsla(0,0%,100%,.2) 2.2%),
    
    -webkit-radial-gradient( 50% 50%, 200% 50%, hsla(0,0%,90%,1) 5%, hsla(0,0%,85%,1) 30%, hsla(0,0%,60%,1) 100%);
}


.metal.radial:before, .metal.radial:after {
  content: "";
  top: 0;
  left: 0;
  position: absolute;
  width: inherit;
  height: inherit;
  border-radius: inherit;
  
  /* fake conical gradients */
  background-image: -webkit-radial-gradient(  50%   0%, 10% 50%, hsla(0,0%,0%,.1) 0%, hsla(0,0%,0%,0) 100%),
    -webkit-radial-gradient(  50% 100%, 10% 50%, hsla(0,0%,0%,.1) 0%, hsla(0,0%,0%,0) 100%),
    -webkit-radial-gradient(   0%  50%, 50% 10%, hsla(0,0%,0%,.1) 0%, hsla(0,0%,0%,0) 100%),
    -webkit-radial-gradient( 100%  50%, 50% 06%, hsla(0,0%,0%,.1) 0%, hsla(0,0%,0%,0) 100%);
}
.metal.radial:before { transform: rotate( 65deg); }
.metal.radial:after { transform: rotate(-65deg); }




/* Linear ------------------------- */

.metal.linear {
  width: 100px;
  font-size: 4em;
  height: 80px;
  border-radius: .5em;
  background-image: -webkit-repeating-linear-gradient(left, hsla(0,0%,100%,0) 0%, hsla(0,0%,100%,0)   6%, hsla(0,0%,100%, .1) 7.5%),
    -webkit-repeating-linear-gradient(left, hsla(0,0%,  0%,0) 0%, hsla(0,0%,  0%,0)   4%, hsla(0,0%,  0%,.03) 4.5%),
    -webkit-repeating-linear-gradient(left, hsla(0,0%,100%,0) 0%, hsla(0,0%,100%,0) 1.2%, hsla(0,0%,100%,.15) 2.2%),
    
    linear-gradient(180deg, hsl(0,0%,78%)  0%, 
    hsl(0,0%,90%) 47%, 
    hsl(0,0%,78%) 53%,
    hsl(0,0%,70%)100%);
}


/* Oval ------------------------- */

.metal.linear.oval {
  margin-top: 100px;
  width: 70px;
  height: 60px;
  line-height: 60px !important;
  border-radius: 50%;
  font: italic bold 3em/50px Georgia, "Times New Roman", Times, serif;
}




/* active ------------------------- */

.metal:active {
  color: hsl(210, 100%, 40%);
  text-shadow: hsla(210,100%,20%,.3) 0 -1px 0, hsl(210,100%,85%) 0 2px 1px, hsla(200,100%,80%,1) 0 0 5px, hsla(210,100%,50%,.6) 0 0 20px;
  box-shadow: 
    inset hsla(210,100%,30%,  1) 0  0px 0px 4px, /* border */
    inset hsla(210,100%,15%, .4) 0 -1px 5px 4px, /* soft SD */
    inset hsla(210,100%,20%,.25) 0 -1px 0px 7px, /* bottom SD */
    inset hsla(210,100%,100%,.7) 0  2px 1px 7px, /* top HL */
    
    hsla(210,100%,75%, .8) 0  0px 3px 2px, /* outer SD */
    hsla(210,50%,40%, .25) 0 -5px 6px 4px, /* outer SD */
    hsla(210,80%,95%,   1) 0  5px 6px 4px; /* outer HL */
}
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