cb2_api_cmb2-exampledefinition.php

<?php	

// Start with an underscore to hide fields from custom fields list
	$prefix = '_cb2_velogistics_';

	/**
	 * Initiate the metabox
	 */
	$cmb = new_cmb2_box( array(
		'id'            => '_cb2_velogistics_',
		'title'         => __( 'Velegistics properties', 'cmb2' ),
		'object_types'  => array( 'cb2-item', ), // Post type
    'fields'        => array (
      		'name'       => __( 'Max load', 'cmb2' ),
          'id'         => $prefix . 'maxLoad',
          'type'       => 'text',
	    ) )
	) );

?>