DX plastic is Innova's cheapest plastic. Good for beginners, but as you improve, and throw faster, it will wear out quickly. Each manufacturer has different names for their plastics. For Innova, order for their main plastics, cheapest to best: DX, Pro, GStar, Star, Champion. They have others that mix in: XT, R-Pro, Glow, and more. You can search online to learn them all if you care. Innova is a great place to start because they are huge, and they sell F2s on their website super cheap. F2 is discs with misprints, blemishes in color, etc. Search Innova F2 Fridays online, and you can find out more. Basically, every Friday they put out a code online for a free F2 disc if you buy any 3 or more discs. Their F2 DX discs are $6. Pro is $9. They charge $6 shipping, but over $75 shipping is free. Order 5 or more discs, get 10% off, and I think 10 or more is even more discount. There is a F2 Friday thread posted on this site, and Bill usually pastes the F2 code in there every Friday. F2 Friday is probably the best deals you can get for new discs (IMHO).