What is a Bowling ball made of?
What is a Bowling ball made of?
A dense shaped weight block inside a filler, wrapped in a polyester, urethane or reactive resin coverstock.
Almost everything interesting about a modern bowling ball is invisible. Lanes are dressed with oil in a pattern that is heavier in the middle than at the edges, so the ball skids through the oil, grips the dry back end and hooks. The coverstock decides when that grip happens and the internal weight block decides how violently the ball changes direction once it does. Serious bowlers re-sand or polish the cover as it absorbs lane oil, and the ball is periodically baked to draw oil back out of the pores.
Component by component
| Part | Material | Why that material |
|---|---|---|
| weight block | dense resin loaded with barium or bismuth, moulded into a deliberate asymmetric shape | The block's shape, not the surface, sets how early and how hard the ball hooks — it moves the centre of mass off the geometric centre. |
| filler | lower-density polyester or urethane resin | It brings the ball up to the legal 27 in circumference at the chosen weight without disturbing the weight block's effect. |
| coverstock | polyester (plastic), urethane, or reactive resin urethane | Reactive resin is porous at a microscopic scale and grips oiled lane surfaces; plastic slides straight and is used for spares and house balls. |
| finish | sanded or polished surface, from about 500 to 4000 grit | Surface roughness decides where on the lane the ball starts to grip, and is the cheapest thing a bowler can change. |
Other sport and games objects
- Tennis ball A pressurised hollow shell of vulcanised rubber, covered in a glued-on wool and nylon felt.
- Golf ball A moulded polybutadiene rubber core inside an ionomer or urethane cover, dimpled all over.
- Soccer ball Polyurethane outer panels over a laminated fabric backing, wrapped around a latex or butyl bladder.
- Basketball A pebbled composite or leather cover over nylon winding and a butyl rubber bladder.
- Cricket ball A cork core tightly wound with wool yarn, cased in four pieces of dyed leather with a stitched seam.
Common questions
- What is a Bowling ball made of?
- A dense shaped weight block inside a filler, wrapped in a polyester, urethane or reactive resin coverstock.
- What is the weight block of a Bowling ball made of?
- Dense resin loaded with barium or bismuth, moulded into a deliberate asymmetric shape. The block's shape, not the surface, sets how early and how hard the ball hooks — it moves the centre of mass off the geometric centre.
- What is the filler of a Bowling ball made of?
- Lower-density polyester or urethane resin. It brings the ball up to the legal 27 in circumference at the chosen weight without disturbing the weight block's effect.
Related pages
- Tennis ball A pressurised hollow shell of vulcanised rubber, covered in a glued-on wool and nylon felt.
- Golf ball A moulded polybutadiene rubber core inside an ionomer or urethane cover, dimpled all over.
- Soccer ball Polyurethane outer panels over a laminated fabric backing, wrapped around a latex or butyl bladder.
- Basketball A pebbled composite or leather cover over nylon winding and a butyl rubber bladder.
- Cricket ball A cork core tightly wound with wool yarn, cased in four pieces of dyed leather with a stitched seam.
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Sources
- Typical range compiled from manufacturer specifications — At One Place