Make extraordinary pens with Mother of Pearl Pen Blanks. Mother of Pearl - a very popular decorative finish on watch faces, knives and jewelry is now available in Pen Blanks from PSI. Mother of pearl is a luminescent material from the inside of pearl oysters. The blanks are made by laminating the pearl pieces to pen tubes then encapsulating and hardening in a UV resistant polyester resin. The blanks turn and finish the same as typical acrylic pen blanks. Blank sizes are 3/4" x 3/4" x 5" with pen tube pre-installed.