Technical sheet

C4 Naifu S knife

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10 Reviews

21 Questions

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Size

Long

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Unstrung

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Features of C4 Naifu S

Product description of C4 Naifu S knife

Description summary

NAIFU and NAIFU S feature an innovative and ergonomic design. NAIFU is a belt knife with a total length of 204mm and a blade length of 94mm. NAIFU S is a smaller knife, designed to be carried on the arm, with a total length of 144mm and a blade length of 66.5mm. The handle and the sheath are manufactured in recyclable POM material. This is a very sturdy and autolubricating material with excellent mechanical properties and low water absorption. NAIFU has a locking system between the knife and the sheath which makes it for an easy extraction and insertion. The blade of NAIFU S is inserted all the way in the handle making it extremely sturdy. NAIFU’s blade features a shaft remover and comes out from the bottom of the blade so that it can be used as a light hammer. A very important feature on the NAIFU knives is that the blade is machined to create a razor cutting edge whose geometry greatly increases its cutting and penetrating effect. Both knives are delivered with two rubber straps with stainless steel buckles for use on the arms or legs. NAIFU sheath also features two holes on the bottom so that an additional elastic can be used to hold the knife in position.

Specifications

Manual

Technical specifications of C4 Naifu S

Features of C4 Naifu S

Color Black

Color

Black

Recommended Use Spear Fishing

Recommended Use

Spear Fishing

Product Type Knives

Product Type

Knives

Key differentiators

Compact and lightweight design, ideal for arm or weight belt mounting.

Durable construction with a handle and sheath made from sturdy POM material.

Features a reliable locking mechanism for secure storage and easy access.

Includes straps for immediate mounting and use.

Multi-functional blade includes a shaft remover and a light hammer feature.

Technology in C4 Naifu S knife

Energy rating

Warnings

4.9 / 5

10 Reviews

What our customers are saying about C4 Naifu S knife

This compact dive knife offers excellent quality and sharp performance. Its small size is ideal for arm mounting, ensuring safe and convenient access during dives. The reliable locking system and sharp blade are praised, though some find the blade length a bit short. The finishes are noted as very good for this lightweight and compact safety knife

Excellent product

2025/09/26

Francesco

Excellent product...even though it's small, it does its job. I made the smooth side of the blade sharper to make any cuts easier. I recommend it.

Too small

2022/12/24

Bruno Barros

Good quality and well finished but too small for my taste. They put the measurements so it's my fault 100%.

C4 naifu S black

2021/09/29

Seahunter

Sharp point knife. Have rubber lock at the sheath. The rubber strap not too help the knife to it’s position. I more prefer stick it to the weight belt. Thanks me later

C4 Naifu S

2020/12/10

Gunnar B Fjelstul

very good knife, smaller than expected

Good

2020/08/05

Clément

Good knives hold well in the case for the moment, a little hard caught the first exit then after it goes, to see if big glove the winter will need maybe to add a string on the end of the handle

Knife c4

2020/07/26

Francisco

Very good knife with good finishes small and compact perfect for the arm or the belt

C4 Naifu S

2020/02/29

Dzmitry

C4 Naifu S small, use as spar knife for safety, very light , actual price.

C4 Knife

2026/04/17

Fatih

The knife is perfect size is really good it’s small and very easy to use it quick.

Good quality!

2022/09/11

Amorim

Very small, is the perfect size for using in the arm. The locking system is very simple but reliable. The blade is a little too short but it's very sharp. Overall good quality.

Knife top

2021/05/21

Maurício Viana Corrêa

Perfect knife to use on your arm more safely on dives, excellent quality

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Include AI Generated questions and answers

2026-09-13

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What are the main features of the C4 Naifu S dive knife?