Are they sharp? For example, sharp enough to cut an apple?

The tip is quite pointed and when dropped in a free-fall from 12" will impact oak and remain standing. The blade edges are slightly honed to a sharpness that can smoothly cut paper when drawn perpendicular across the edge at a 1/4" point freely suspended by pinched fingers. This is not a dangerous sharpness but I consider somewhat sharp. I did not try this on an apple but it does cut a potato with no problems. My guess is you will have no problems with an apple. You probably will need to sharpen it a bit more if you want to shave the skin or "peelings." I have many knives and have made my own since the 1960's. These are short but I can still get them to stick. Note that kitchen knives are thin all the way though which makes cutting easier. These knives are not really kitchen knives, and have a little bit more thickness on the blade, which helps develop the mass (weight) to deliver a force needed to penetrate when thrown. Check out the physics formula where force = mass x acceleration. Hope this helps!

What are the size of these???

6" total length. They are like 3 1/2" blade length.

Does anyone have a solution to the handles coming undone?

Wrap them and sip the handle in polyurethane on something like that. Let dry, re-dip and have at it. I did mine the first time they came undone, haven’t had a problem yet...

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Ace Martial Arts Supply Ninja Stealth Black Throwing Knives with Nylon Case (KUNAI) (3 pieces)

Product ID: 1207929

Details

Age Range (Description)
Adult
Blade Material
Stainless
Brand
Ace Martial
Color
Black
Handle Material
Stainless
Included Components
Sheath

🎯Precision 6-inch Length

🖤Stealth Black Finish

🗡️440 Stainless Steel Blades

131.83 DT

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖤 Sharpen your edge, own the throw, and never miss the mark.

PRO GRADE FIXED BLADE - Reliable spear point tanto blades engineered for competitive throwing and target practice.
ELITE 440 STAINLESS STEEL - Durable, corrosion-resistant blades built to last through intense practice sessions.
SLEEK STEALTH BLACK DESIGN - Modern matte finish that commands respect and blends into any tactical setup.
COMPACT NYLON SHEATH INCLUDED - Carry your set discreetly and safely with the lightweight, durable black nylon case.
PERFECT 6 INCH THROWING LENGTH - Optimized size for superior balance and accuracy in every throw.

Ace Martial Arts Supply Ninja Stealth Black Throwing Knives are a professional 3-piece set featuring 440 stainless steel fixed blades with a sleek black finish. Each 6-inch spear point tanto knife is designed for precision and durability, perfect for target practice and competitive throwing. The set includes a compact nylon sheath for safe, stylish transport.

Specifications

ASIN	B00162KUII
Age Range Description	Adult
Best Sellers Rank	#284,102 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #160 in Martial Arts Knives
Blade Edge	V-Grind
Blade Length	4 inches
Blade Material	Stainless Steel
Blade Shape	Spear Point
Blade Type	tanto
Brand Name	Ace Martial Arts Supply
Color	Black
Customer Package Type	Box or Padded Envelope
Customer Reviews	4.2 4.2 out of 5 stars (2,184)
Global Trade Identification Number	00024409373299
Handle Material	Stainless Steel
Included Components	Sheath
Item Length	6 inches
Item Shape	Spear Point
Item Weight	6.38 ounces
Manufacturer	Ace Martial Arts Supply
Model Name	0024409373299
Model Number	0024409373299
Number of Items	3
Part Number	A3262
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	Target Practice, Competitive Throwing
Reusability	Reusable
Set Name	3 pieces
Size	3 pieces
Special Features	Fixed Blade
Style	Modern
Theme	Sport
UPC	024409373299
Unit Count	3 Count

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