Walnut Shells in Black Alumilite Pen Blank – by John Underhill

Turn something truly different with this striking Walnut Shells in Black Alumilite Pen Blank by John Underhill. Made with pieces of real walnut shell embedded in rich black Alumilite resin, this unique casting creates an eye-catching organic pattern filled with natural curves, openings, and irregular shapes.

The warm golden-brown tones of the walnut shells stand out dramatically against the deep black resin, creating exceptional contrast from every angle. Because genuine walnut shells are used in each casting, no two blanks will ever be exactly alike. Every finished pen will reveal its own arrangement of natural shell fragments and intricate details as the blank is turned.

At approximately 5-1/8" long x 7/8" square, this generously sized blank provides plenty of material for a wide variety of pen kits. It is especially attractive on larger-bodied pens where more of the unusual walnut shell pattern can be displayed.

Created by John Underhill, this specialty blank is an excellent choice for pen turners looking for something beyond a traditional acrylic or wood blank.

Features & Highlights

• Made with real walnut shells embedded in black Alumilite resin

• Dramatic golden-brown and black color contrast

• Natural shell shapes create an intricate, organic pattern

• Every blank is unique due to the natural walnut shell inclusions

• Generously sized for a wide variety of pen styles

• Excellent choice for larger-bodied fountain pens, rollerballs, and ballpoints

• Alumilite resin turns and polishes to a beautiful smooth finish

• Designed and cast by John Underhill

• Makes a distinctive choice for custom pens, gifts, and craft show projects

Perfect For

• Custom handcrafted pens

• Fountain pens and rollerballs

• Larger-bodied pen kits

• Executive and gift pens

• Nature-inspired projects

• Unique gifts for woodworkers and outdoors enthusiasts

• Craft show and gallery pieces

• Pen turners looking for an unusual alternative to traditional acrylic blanks

Specifications

• Material: Walnut Shells & Alumilite Resin

• Resin Color: Black

• Inclusions: Genuine Walnut Shells

• Approximate Size: 5-1/8" x 7/8" x 7/8"

• Transparency: Low / Opaque

• Shape: Rectangular

• Good for Threading: No

• Maker: John Underhill

• Pattern: Random – each blank will vary

• Price: Per Each

Turning Tips

Because these blanks combine natural walnut shell with Alumilite resin, you will be turning materials with different densities within the same blank.

• Use sharp tools and light, controlled cuts

• Avoid aggressive cuts, particularly when approaching exposed shell inclusions

• A negative-rake carbide cutter can be especially helpful with mixed-material blanks

• Drill carefully and clear chips frequently to prevent excess heat buildup

• Sand progressively through fine grits to smooth both the resin and walnut shell

• Finish with your favorite acrylic/resin polishing system for a deep, glossy surface. (We recommend the Gluboost system)

• As with other embedded-material blanks, take your time—the intricate pattern becomes increasingly dramatic as the blank is turned

Why Choose a John Underhill Walnut Shell Blank?

John Underhill is known for creating unusual blanks that transform unexpected materials into memorable writing instruments. The combination of natural walnut shells and jet-black Alumilite gives this blank a look that is simultaneously rustic, contemporary, and completely unique.

The irregular shell patterns mean the design continues to change as you turn deeper into the blank, making the finished result part of the fun. You won't know exactly what pattern is waiting inside until you turn it.