The page describes this as an aluminium alloy, copper, and finally, in the description, brass. Which is it?

Looks like a mix to me. It's well built and easy to use and puts out a good ring

Should this be mounted on the left or right on a mountain bike?

I believe the best answer to the question whether the bell should be mounted on the left or the right on a mountain bike …is “yes”.

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Bike Bell Classic Bicycle Bell Mountain Bike Bells for Adults with Loud Sound and Fit for 0.87-1.25in/22.2-31.8mm Bicycle Handlebars

Bike Bell Classic Bicycle Bell Mountain Bike Bells for Adults with Loud Sound and Fit for 0.87-1.25in/22.2-31.8mm Bicycle Handlebars

Product ID: 525211451

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Details

Color
Black
Size
One Size
Brand
ROCKBROS
Material
Brass bell
Style
Bike Bell

🔔Super loud brass bell

🔧Easy 4-step install with hex wrench

🛡️Anti-rust, anti-aging brass & nylon

Description

🔔 Ring in safety and style—because your ride deserves to be heard!

BUILT TO LAST - Premium brass and nylon construction resists rust and aging, ensuring your bell stays pristine ride after ride.
FITS MOST BIKES - Versatile design fits road, mountain, and kids’ bikes with handlebar diameters from 22.2 to 31.8mm.
INSTALL IN MINUTES - Comes with a hexagonal wrench and anti-skid pads for a secure fit on 0.87-1.25in handlebars—no bike mechanic needed.
HEAR ME LOUD CLEAR - Brass bell with collision system delivers a sharp, sustained ding that commands attention on any trail or street.
SCRATCH FREE SECURE - Soft silicone layers protect your bike’s finish while keeping the bell firmly in place during every adventure.

The ROCKBROS Classic Bike Bell features a super loud brass bell with an internal collision system for clear sound, fits handlebars from 0.87 to 1.25 inches using included anti-skid pads and hex wrench, and is crafted from durable, anti-rust brass and nylon materials. Designed for easy installation and compatibility with most bike types, it offers a stylish, reliable safety upgrade for adult cyclists.

Specifications

Color	Black
Size	One Size
Brand	ROCKBROS
Material	Brass bell cover+nylon+stainless steel screw
Style	Bike Bell,classic
Mounting Type	Handlebar Mount
Maximum Compatible Size	22.2 Millimeters
Minimum Compatible Size	22.2 Millimeters
Product Dimensions	3.58"L x 1.57"W x 2.44"H
UPC	648568478628
Manufacturer	ROCKBROS
Item Package Dimensions L x W x H	3.94 x 2.52 x 1.54 inches
Package Weight	0.03 Kilograms
Item Dimensions LxWxH	3.58 x 1.57 x 2.44 inches
Brand Name	ROCKBROS
Warranty Description	1 year warranty service
Model Name	Bike Bell
Suggested Users	unisex-adult
Part Number	34210005001/US
Included Components	anti-skid pad, hexagonal wrench, stainless steel screw

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