Permanent Marker InkSize & Spec.: 2.5ml per bottle, 12 bottles per boxMaterial: PPSpec. 1: Twist top to open, add ink by dipping to marker tampon, designed for 1 time usageSpec. 2: 1 bottle to refill 1 "nearly empty" marker, stop dipping if tampon is full of inkSpec. 3: For all Deli Black refill..