Their deck is fully covered by plywood, and is painted in blue in European and Russian countries. Two-way pallets are designed to be lifted by the deckboards. Four-way pallets, or pallets for heavy loads (or general-purpose systems that might have heavy loads) are best lifted by their more rigid stringers. These pallets are usually heavier, bigger and more durable than two-way pallets. ISO pallets The International Organization for Standardization (ISO) sanctions six pallet dimensions, detailed in ISO Standard 6780:2003 Flat pallets for intercontinental materials handling — Principal dimensions and tolerances, which was reviewed and confirmed in 2014: North American pallets Of the top pallets used in North America, the most commonly used by far is the Grocery Manufacturers Association (GMA) pallet, which accounts for 30% of all new wood pallets produced in the United States. The ISO also recognizes the GMA pallet footprint as one of its six standard sizes. European pallets Australian standard pallets The Australian standard pallet is a pallet size commonly found in Australia but rarely found elsewhere. It is a square pallet originally made of hardwood in size which fits perfectly in the RACE container of the Australian Railway. They are ill-suited for the standard 20 feet (6.1 m) and 40 feet (12 m) ISO shipping containers used around the globe. Australian standard pallets are usually manufactured in hardwood, but 1165 × 1165 mm pallets can also be manufactured using lighter timber suitable for use as disposable pallets using 16 millimeter boards. Extensively used in storage and warehousing, they are popular pallets for racking, with the right shape and size to be removed from transport and directly onto warehouse racking for storage. The Australian Standard Pallet dates back to World War II, while ISO containers date to the late 1950s. Although the pallet's dimensions pre-date the ISO containers, it requires less dunnage, is square, and leaves less wasted space than other pallets, including the GMA pallet. In 2010, Australia adopted the globally accepted ISPM 15 wood packaging material regulations (before this time it was hardwood and more expensive). Standard-setting organizations A number of different organizations and associations around the world work towards establishing and promulgating standards for pallets. Some strive to develop universal standards for pallet dimensions, types of material used in construction, performance standards, and testing procedures. Other organizations choose to focus on pallet standards for a specific industry (such as groceries) or type of