Cheques are negotiable instruments defined as bills of exchange drawn on a specific banker, payable on demand. Banks issue printed cheque forms to customers with serial numbers recorded against accounts. Cheques are considered stale after 6 months if not post-dated, and post-dated cheques will not be honoured. Cheques can be crossed or uncrossed, with crossed cheques only able to be deposited and not cashed over the counter. Special crossing names a specific bank to receive payment.