 The treaty does not include anti-tank mines, cluster bombs or claymore-type mines operated in command mode and focuses specifically on anti-personnel mines, because these pose the greatest long term (post-conflict) risk to humans and animals since they are typically designed to be triggered by any movement or pressure of only a few kilograms, whereas anti-tank mines require much more weight (or a combination of factors that would exclude humans).Existing stocks must be destroyed within four years of signing the treaty.Signatories of the Ottawa Treaty agree that they will not use, produce, stockpile or trade in anti-personnel land mines.