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Hi @demonshi
Thank you for your interest in the Filter Everything plugin.
There is no possibility to create a range slider by product attribute. You can do it only by the custom numeric field. Each attribute has its own name and slug same as the terms inside of it. It is not just one meta key with different numeric values.
Maybe with future updates, we will implement something to have the possibility to do it, but at the time we are working on another plugin functionality.
Best Regards – Victor