PRX Rubber Hex Dumbbells
Fixed rubber hex dumbbells from 3 to 100 lb — nothing to adjust, nothing to break, and a handle that thickens as the weight goes up.
Specs
| Weight range | 3 to 100 lb |
|---|---|
| Head | Rubber-coated hex |
| Handle | Chrome-plated, knurled, contoured |
| Handle diameter, 5 to 12 lb | 25 mm |
| Handle diameter, 15 to 100 lb | 34 mm |
| Handle length | 5 in |
These figures are copied from PRX Performance’s own published specs and were last checked on 2026-08-31. Manufacturers revise products without notice, and variants differ. Confirm anything your decision depends on with PRX Performance before you buy.
Choose this one if
- You are done with adjusting and want to pick a dumbbell up and use it
- You do drop sets or supersets, where changing an adjustable costs you the set
- You have wall space for a rack and are not fighting for every square foot
The detail
Fixed dumbbells are the honest opposite of every adjustable on this site. There is no mechanism, so there is nothing to seat wrong, nothing to drop out, and nothing whose warranty you need to read. You pick one up and use it.
The case for them is drop sets and supersets. Going from 50 to 40 to 30 with a NÜOBELL or a PowerBlock means walking to the cradle and re-selecting twice, which is enough of an interruption to change the training effect. With fixed dumbbells you turn around.
The case against is space and money. A full 3–100 lb range is a wall of iron and a rack to hold it, where an adjustable pair is one footprint. This is the single biggest decision in the category and it is decided by your room, not by the product.
The handle diameter steps from 25 mm on the 5–12 lb dumbbells to 34 mm from 15 lb up. That is a sensible progression — a thicker handle on heavier weight spreads the load across your palm — but 34 mm is genuinely thick, thicker than a barbell's 28.5, so grip becomes a factor on heavy rows and carries sooner than you might expect.
Rubber hex heads are the right choice for a home gym: they do not roll away, they stack, and they will not chip a floor the way cast iron does. They do smell for the first few weeks, and in a hot garage that smell comes back every summer.