Prior to the coming of the real PET bottles, it is first necessary to manufacture the so-called preform. Modern injection moulding presses for the manufacture of preforms have only several seconds in which to make one set of future PET bottles. Everything is a matter of correct dimensioning of the cooling cavities. It always concerns extraordinarily precise products with an unusually smooth inner surface. C.S.O. is a specialist in such components. We have more than ten years of experience with both pilot projects and series products.