Our Diaphragm 3-packs are available in Premium Flex plastic frame and aluminum frame. Aluminum frame E-Z Cutters includes the E-Z Cutter 2.5, E-Z Cutter V and E-Z Deuce Cutter. The Ultimate Starter Pack includes Premium Flex Double D, Raspy Old Hen and E-Z Rasp. The Premium Flex Pro 3-Pack includes the E-Z Rasp, Split V III and The Fang. Premium Flex calls feature the new Infinity Latex™, which requires less air pressure to run, making for more realistic sounds.