Know Your Tools, Know Your Craft

One of the most confusing parts of learning glassblowing is the sheer variety of tools laid out on the bench. Each one serves a specific purpose, and knowing what each tool does — and when to reach for it — is fundamental to developing real skill. This guide covers the core toolkit every glassblower needs to understand, whether you're taking your first class or setting up your own studio.

The Blowpipe

The blowpipe is the primary tool of glassblowing. It's a long, hollow steel tube — typically 4 to 5 feet long — through which the glassblower blows air into molten glass gathered at the end. Blowpipes come in various diameters and wall thicknesses. Thicker pipes retain heat differently and affect how the gather cools. Most studios keep a range of sizes; beginners typically start with a mid-weight pipe around 1 inch in diameter.

Care tip: Always preheat the end of your blowpipe before gathering glass. A cold pipe can cause the gather to crack or fall off.

The Punty (Pontil Rod)

The punty is a solid steel rod used to hold a piece of glass from the bottom once it has been transferred off the blowpipe. This allows the glassblower to open the top of the piece (where the blowpipe was attached) and finish the rim. The punty is attached with a small gather of hot glass that welds to the base of the piece. The mark left behind when the punty is removed — the "punty mark" — is a traditional hallmark of handmade blown glass.

Jacks

Jacks look like large metal tweezers and are one of the most versatile tools in the studio. They're used to:

  • Constrict the neck of a vessel (a technique called "jacking in")
  • Open and shape the rim of a piece
  • Create the "neck line" before cracking a piece off the blowpipe
  • Score decorative lines or ridges into the glass surface

Jacks come in various spring tensions. Beginners often benefit from a lighter spring tension, which requires less hand strength to control.

Marver

A large, flat steel table positioned near the furnace. The glassblower rolls the hot gather across its surface to center it, cool the outside layer, and shape it into a cone before blowing. Some marvers are made of graphite, which offers slightly different heat exchange properties. See our detailed article on marvering vs. blocking for more on this technique.

Wooden Blocks

Blocks are rounded, cup-shaped tools carved from dense fruitwood (cherry, apple, or pear are common). They must be kept soaked in water during use. The steam generated as hot glass contacts the wet wood creates a buffer that shapes and smooths the gather without scorching it. Blocks come in multiple cup sizes to match different gather volumes.

Shears (Glass Scissors)

Shears are heavy-duty scissors designed for cutting molten glass. They're used to trim excess material, cut lips, and shape the openings of vessels while the glass is still hot and workable. Diamond shears have straight blades; pattern shears have serrated edges for decorative cuts. Always use shears with heat-resistant gloves or in a way that keeps your hands well clear of the hot glass.

Graphite Paddles and Mashers

Flat graphite paddles are used to flatten, shape, or texture surfaces. Because graphite doesn't stick to glass and can withstand extremely high temperatures, it's ideal for direct contact with molten material. Paddle shapes vary — flat paddles for walls and bottoms, curved paddles for interior shaping.

Tweezers and Picks

Long-handled tweezers and steel picks are used for fine detail work — pulling handles, creating texture, applying hot glass threads, and manipulating small details on a piece. They're indispensable once you move past basic forms into more complex vessel work.

The Annealing Oven (Kiln)

Strictly speaking, the annealing oven isn't a hand tool — it's a kiln that holds finished pieces at around 900–1,000°F (480–540°C) and then slowly ramps down to room temperature over several hours. Skipping annealing causes glass to crack due to internal stress. Every piece that leaves the blowpipe must go into the annealer.

Building Your Personal Toolkit

If you're taking classes at a studio, all tools are typically provided. When you're ready to invest in your own set, prioritize quality jacks and a good pair of shears first — these are what your hands are on most often. A solid set of hand tools from a reputable supplier will last decades with proper care.