Oil Slick has become kind of the DiamondCast™ signature blank. We weren't the first to do a rainbow colored material, we won't be the last, but we definitely set the bar on this color mix. Our pouring method all but guarantees you get all 6 colors even on smaller pens.
These are best drilled on the lathe and work great for Jr. sized pens and smaller. For best results paint the inside of the blank after drilling. (Tip: Use white paint for brighter rainbow look and black paint for more of an oil slick look.)
Round Blank Measures .81" x 6"