is the outer surface of the sleeve a conductor or an insulator, please?

Its niether. These are single core speaker wire plugs. There is only the centre golf pin that takes the cable. There is no connection to the outer sleeve. Hope this clarifies?

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Nakamichi GrubLock Excel Series 24k Gold Plated Banana Plugs, 10-18 AWG

Nakamichi GrubLock Excel Series 24k Gold Plated Banana Plugs, 10-18 AWG

Product ID: 460534099

Details

Brand
Nakamichi
Cable type
Stereo Audio
Compatible devices
Speaker
Connector type
Speaker Post)
Special feature
Dual-screw

🔊24k gold plating for pristine audio

🔩Dual-screw design for secure fit

🧰Fits 10-18 AWG speaker wires

103.32 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Elevate your sound game with gold-standard connections!

ROCK SOLID GRIP - Dual-screw system locks wires firmly, ensuring stable, interference-free performance.
PRECISION POLARITY - Color-coded sleeves guarantee perfect speaker wire alignment for true sound fidelity.
PURE AUDIO CLARITY - 24k direct gold plating eliminates corrosion and distortion for crystal-clear sound.
TRUSTED DURABILITY - Copper core and 3-year warranty deliver long-lasting, high-performance audio reliability.
EFFORTLESS CONNECTION - GrubLock design plugs in seamlessly—no screwing hassle, perfect for tight spaces.

Nakamichi GrubLock Excel Series banana plugs feature 24k gold plating and a copper core for superior sound quality. Designed for 10-18 AWG speaker wires, their dual-screw system ensures a secure, corrosion-free connection. With color-coded sleeves for polarity accuracy and a 3-year warranty, these plugs simplify setup while delivering pristine audio performance.

Specifications

ASIN	B0B5Y6VHSN
Best Sellers Rank	1,916 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 489 in Hi-Fi & Home Audio Accessories
Brand	Nakamichi
Cable Type	Stereo Audio Screw Connector
Colour	Banana Plugs
Compatible Devices	Speaker, Amplifier
Compatible Phone Models	No Compatible Phone Models
Connectivity Technology	Auxiliary
Connector Gender	Male
Connector Type	Speaker Terminal (Binding Post)
Country Of Origin	United Kingdom
Customer Package Type	Flat Free Package
Customer Reviews	4.7 4.7 out of 5 stars (3,332)
Ethernet Cable Category	Cat 5
External Testing Certification	Não aplicável
Gauge	18.0
Included Components	Banana Plugs
Indoor Outdoor Usage	Indoor
Item Shape	Round
Item Weight	0.03 Kilograms
Manufacturer	Nakamichi
Manufacturer Part Number	NBPA01E
Maximum Current	12.9 Amps
Model Name	Nakamichi Excel Series Banana Plug
Model Number	NBPA01E
Number of Items	4
Number of Pins	8
Other Special Features of the Product	Dual-screw design, Non-conductive sleeve
Outer Material	Copper
Recommended Uses For Product	Connecting and optimizing sound quality in home theaters, Improving audio performance in stereo systems, Simplifying speaker wire management in hi-fi systems, Enhancing sound clarity in automotive audio setups
Specification Met	Copper
UPC	850045360092
Unit Count	4.0 count
Wattage	120 watts

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