“Green Apple” pine cone pen blanks have an electrifying green resin with stabilized pine cones embedded in the casting. The pine cones create an awesome pattern that always turns out amazing! Another fun to turn blank that produces a great looking pen!
Check out info on resin casting. You have a mold, mix the resin with a catalyst. Whatever is in the mold gets embedded in plastic. - This link doesn't include info, but it's a reminder to go check out more info on resin casting