Rapala RSB4 Fillet Knife
- Fillet Knife
- 1
- Stainless Steel
- Multi
A short stainless fillet knife for smaller catches, with a sheath included for storage.
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How it ranks among the 74 fillet knifes we track
4.6★ across 264 Amazon ratings, Bayesian-smoothed toward the category average.
264 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
300+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 74 fillet knifes we track - how the scorecard works · full fillet knifes data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
Rapala's RSB4 is a 4 inch fillet knife in stainless steel, sold with a sheath for storage. Rapala is a long established fishing brand, and this length sits at the shorter end of their fillet knife range, suited to panfish and smaller catches rather than large fish.
A 4 inch blade puts this knife in the panfish and trout category rather than the longer 6 to 9 inch blades used for salmon or larger saltwater species. The included sheath covers blade storage and basic transport safety.
- 4 inch stainless steel blade
- Sheath included
- 1 count
- Rapala brand
Who it's for
Anglers who clean panfish, trout, or other smaller freshwater catches and want a compact blade that fits in a tackle bag. Not sized for filleting large saltwater fish.
Strengths and trade-offs
Drawn from this product's published specifications.
- Includes a sheath for storage and transport
- Stainless steel resists corrosion
- Compact 4 inch size for smaller catches
- Blade may be short for larger fish
Performance notes
Stainless steel resists rust in wet conditions, and the sheath protects both the edge and the angler when the knife is packed away.
Specifications
| Brand | Rapala |
|---|---|
| Model | RSB4 |
| Dimensions & fit | |
| Length | 4 inches |
| Size | 4 inches |
| Construction & materials | |
| Material | Stainless Steel |
| Color | Multi |
| Included components | |
| Pieces | 1 |
| Other details | |
| Special | Sheath |
Other Rapala fillet knifes
How it compares
This product against the closest alternatives we track in fillet knifes.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Rapala RSB4 Fillet KnifeThis product | 4.6 / 5 | 264 | 4.1 / 5 |
| HOSHANHO 7 inch Fillet KnifeHOSHANHO | 4.7 / 5 | 3,900 | 4.5 / 5 |
| BUBBA 1095705 Fillet KnifeBubba | 4.7 / 5 | 6,300 | 4.4 / 5 |
| KastKing Fishing Knives-3 Fillet KnifeKastKing | 4.6 / 5 | 2,700 | 4.4 / 5 |
| WORKPRO W125223AE Fillet KnifeWORKPRO | 4.7 / 5 | 828 | 4.4 / 5 |
Similar fillet knifes from other brands
Questions about the Rapala RSB4
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What size fish is the Rapala RSB4 fillet knife best suited for?
Its 4 inch blade suits panfish and trout sized catches rather than large fish that need a longer blade.
Does the RSB4 come with a sheath?
Yes, a sheath is included for blade storage.
What material is the blade?
Stainless steel.