Borosilicate Skull milli. To Ensure our Customers the best Premium Quality Pictures, our Millifiories must INITIALLY be purchased in a THREE GRAM INCREMENT - This ensures YOU clean & workable images. ( Scoring & Breaking Glass under 3 grams is quite tough if aiming for Straight Clean-Cut Milli Images.) If customer chooses a Milli Quantity of ONE, they will be automatically charged and shipped for the MINIMUM of THREE grams. Only $3.00 per Gram Thereafter.