Buying Used Dumbbells: Cast Iron, Hex and Pro-Style Compared

Dumbbells are one of the most versatile pieces of equipment you can own, and they almost never wear out — which makes used dumbbells a smart buy. Here's how the main types compare and what to check before buying a used set.

Quick answer: Rubber hex dumbbells are the best all-round value for home and commercial gyms. Cast iron is cheapest but louder and harder on floors. Urethane and pro-style dumbbells look and last the best but cost the most. Used sets of any type can save a lot if the heads are tight and the handles are in good shape.

Types of Dumbbells

Cast iron

Plain cast iron dumbbells (hex or round) are the most affordable. They're very durable but loud, and they can chip floors and rust if left in damp conditions.

Rubber hex

Iron heads coated in rubber, with a hexagonal shape so they don't roll. Quieter and kinder to floors, and the most common choice for home and commercial gyms.

Urethane

Urethane coating is tougher and more odor-resistant than rubber and keeps its looks for longer. Often seen in high-end clubs, at a higher price.

Pro-style (round)

Round heads, often welded or fixed with a solid connection, common in commercial gyms. Make sure they're stored on a rack designed for round dumbbells.

Adjustable

Adjustable dumbbells save space at home but are less suited to busy commercial gyms. See our adjustable dumbbell guide.

What to Check on Used Dumbbells

• Loose heads: shake each dumbbell. Any rattle or movement between the head and handle is a safety concern.
• Coating damage: torn rubber is mostly cosmetic, but heavy damage can expose iron and keep tearing.
• Handles: check the knurling (grip texture), straightness and any rust.
• Weight accuracy: markings should be legible; for a commercial gym, spot-check a few on a scale.
• Matching pairs: make sure each weight has a matching partner of the same style.
• Rack included? A sturdy rack is essential, and buying it with the set is usually cheapest.

How Many Do You Need?

A home gym can do a lot with a handful of pairs, but a commercial gym typically needs a full run in 5 lb steps up to 75–100 lb or more. If you're opening a gym, see our commercial gym equipment list.

Care Tips

Keep dumbbells on a rack, not the floor. Wipe down handles regularly, and treat bare iron with a light coat of oil if it's stored in a garage. More tips are in our gym equipment maintenance checklist. You can learn more about dumbbell history and design on Wikipedia.

Looking for dumbbells or a full free-weight area? Contact us with what you need, and browse our current equipment.