Indians For Guns

Hi... I want to order knives for edc use from the website http://www.globaltacticalsupply.com

Is there any special permission required to buy them from a foreign country and get it shipped?

The knives I wanted are:
http://globaltacticalsupply.com/product ... 0404011975
And

http://globaltacticalsupply.com/product ... 6284776327

Is it possible to import spring assisted knife through post from foreign countries if their Blade lengths are less that 6" and width is less that 2"?..
Will I land up in trouble? Or held by law?

And any other information I should be aware of?...

Thank you