These carb caps will be a great add in function and look to any piece.  The colors on these things are stunning.  Drop this into your nail to make sure you are getting the best hit possible. 

• Type: carb cap
• Material: borosilicate glass
• Colors: black, violet, blue, or green
• Dimensions: 1.5"(L) 1.5"(W) x 1.5"(H)
• Weight: .04 lbs