WP_Model-create.php

<?php
$product = new Product;
$product->color = 'white';
$product->weight = 300;
$product->title = 'the post title';
$product->content = 'the post content';
$product->save();
// OR
$product = new Product([
    'color' => 'blue',
    'weight' => '250'
]);
$product->save();
// OR
$product = Product::insert([
    'color' => 'blue',
    'weight' => '250'
]);