protected function query_args( $type = '', $page = 1 ){
		$args = [
			'post_type' => $this->post_type,
			'paged' => $page,
		];

		if( ! empty( $page ) ){
			$args ['tax_query' ] =[
				[
					'taxonomy' => 'product_type',
					'field'    => 'slug',
					'terms'    => $type,
				],
			];
		}

		return $args;
	}