Prodigy Discs says this about the A4: The all new A4 is the latest in our range of approach discs. The A4 is a slightly over stable disc that fills the distance gap between midranges and putters and is designed for all skill levels. The disc is consistent and reliable in moderate wind conditions and perfect for short approach shots. It works equally as well for backhand or sidearm throwers. The A4, like the A3 has a bead on the rim. You can expect it to fly slightly less stable than the A3 with an extra 40-50 feet in distance.
About 400 Series Plastic
The 400 series is a premium blend of material that is extremely durable. The unique blend of plastics feels as good as it looks and will be able to be broken in over time. This tour quality plastic gives the thrower better grip even when it is wet.