What is shipping_price in Shipping plugins

Array ( [5] => stdClass Object ( [shipping_id] => 5 [shipping_type] => custom_manual [shipping_zone_namekey] => [shipping_tax_id] => 0 [shipping_price] => 6.15 [shipping_currency_id] => 5 [shipping_name] => Custom Plugin [shipping_description] => Test [shipping_published] => 1 [shipping_ordering] => 1 [shipping_params] => stdClass Object ( [shipping_percentage] => 0 [shipping_per_product] => 1 [shipping_price_per_product] => 1 [shipping_override_address] => 0 [shipping_override_address_text] => [shiptoschool] => 1 [other_name] => Other [other_price] => 20 [shipping_warehouse_filter] => [shipping_min_price] => 0 [shipping_max_price] => 0 [shipping_virtual_included] => 1 [shipping_price_use_tax] => 1 [shipping_min_quantity] => [shipping_max_quantity] => [shipping_min_weight] => [shipping_weight_unit] => kg [shipping_max_weight] => [shipping_min_volume] => [shipping_size_unit] => m [shipping_max_volume] => [shipping_zip_prefix] => [shipping_min_zip] => [shipping_max_zip] => [shipping_zip_suffix] => [shipping_min_price_orig] => [shipping_max_price_orig] => ) [shipping_images] => [shipping_access] => all [shipping_price_orig] => 5.00000 [shipping_currency_id_orig] => 2 [shippingkey] => 0 [shipping_price_base] => 5.1539484398998 ) )