The advantage of pet preform is: small investment in equipments, small minimum order quantity, fast changing of mold during production. While the disadvantage is: the thickness of bottle blow would be different because of uneven heating.
The available screw sizes of our pet bottles are:18/410, 20/410, 22/410, 24/410, 28/410, 32/410, 36/410, 40/410. While for pet jars we also have other screw sizes: 69/410, 87/410, 79/410, 90/410.