A system comprises an encryption engine and a host processor coupled to the encryption engine. Each of the discount prices for a given product has an associated threshold purchase total that has to be satisfied before the discount price is applied to a transaction. Various markings can then be applied on the basis of the layout such that when the ball or sphere is rotated, the markings form contrast lines that are perpendicular to the axis of spin of the ball or sphere, at any axis of spin. The blood reservoir contains an anticoagulant which suppresses coagulation of the blood.