It can be difficult to tell the difference between the plastic and metal one, this page is here to help

For those with a small digital scale the original plastic throttle is lighter, the newer beefed up version is nearly double the weight.

2.6 oz plastic
4.3 oz alloy​

Newer aluminum one is also bit more glossy and the logo is larger.
See below for difference.

Click image for larger version

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Distributors and builders of life changing electric bikes.