you have something to sell for £1000
  They send you a cheque/bankers draft for £2000
  They then ask you to pay for shipping, and send the remaining balance via wire transfer, once the draft has cleared (normally a couple of days).  Then after 2/3wks the bankers draft is found to be fraudulent, and the bank then takes the money back out of your account.  By this stage you have shipped the kit, and payed for it out of your bank, transfered the remianing balance, and also shipped your kit off.
  Losing your stuff you had for sale, and paying to do it aswell. The banks are normally ones located in Cyprus, or other forienge countries.
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