If the material is "copper", why is the color silver (like aluminum)?

They are tinned copper, not aluminum.

What are the exposed pin lengths

From approximately 0.24" to 0.47" long.

for 12 awg wire once crimped down. How large is the crimp end? Would it fit in the back of an A/V receiver that uses the spring back type terminals?

depends upon the spring lock connectors. i personally do not like to use a ferrule on the speaker wires.

I want to use these for clay cutters. Are all the metal ends of each color a different size? What is the size range from largest to smallest?

They are different sizes it. and it says in the description they are 24-10 AWG. So about 0.125 to 0.025 inches in diamerter https://www.calmont.com/wp-content/uploads/calmont-eng-wire-gauge.pdf

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800PCS Wire Ferrules

Product ID: 40894191

Details

Gauge
AWG 24-10
Connector Type
Crimp
Contact Material
Copper
Insulation Material
Polyvinyl
Terminal
Pin Terminal

✅RoHS compliant

📦800 pcs included

🔌AWG 24-10 range

NZ$153

Duties & taxes included

In stock

Sold byAmazon Cook IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Gauge
AWG 24-10
Connector Type
Crimp
Contact Material
Copper

Description

🔧 Elevate Your Electrical Game with 800 Ferrules!

EASY TO USE - Streamlined design for hassle-free installation.
SAFETY FIRST - 100% RoHS compliant for peace of mind.
COMPREHENSIVE KIT - Includes 8 sizes to meet all your electrical needs.
HIGH QUALITY MATERIALS - Crafted from durable copper and PVC for longevity.
VERSATILE CONNECTIVITY - Perfect for wiring machines, PLCs, and more!

The Sopoby 800PCS Wire Ferrules Kit offers a comprehensive solution for all your electrical projects, featuring a range of 24-10 AWG terminals made from high-quality copper and PVC. This kit includes 800 pieces in 8 sizes, ensuring you have the right connector for any job, all while being 100% RoHS compliant.

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