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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Description

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

INSTALL IN MINUTES - Comes with a hex wrench and anti-skid pads for a secure fit on either handlebar side—no mechanic needed.
HEAR ME LOUD CLEAR - Brass bell with internal collision system delivers a crisp, sustained ding that commands attention for safer rides.
BUILT TO LAST SHINE - Premium brass and nylon construction resists rust and aging, keeping your bell looking sharp ride after ride.
UNIVERSAL HANDLEBAR FIT - Adjustable to fit most bikes including road, mountain, and kids’ bikes with handlebar diameters from 0.87 to 1.25 inches.
RIDE CONFIDENTLY ALWAYS - Compact design that doesn’t clutter your handlebars but boosts your visibility and safety on every journey.

The ROCKBROS Bike Bell features a super loud brass bell with an internal collision system for clear sound, easy installation with included hex wrench and anti-skid pads, and fits most bike handlebars (22.2-31.8mm). Crafted from rust-resistant brass and nylon, it offers durable, compact safety for all riders.

Specifications

Color	Black
Size	One Size
Style	Classic
Material Type	Brass bell cover+nylon+stainless steel screw
Included Components	anti-skid pad, hexagonal wrench, stainless steel screw
Batteries Included?	No
Brand	ROCKBROS
Department	unisex-adult
Manufacturer	ROCKBROS
Item model number	34210005001/US
Product Dimensions	9.09 x 3.99 x 6.2 cm; 32 g
ASIN	B0BY2ML8FK