I'm stumped. What does this prefix-list accomplish?

Applied to a Cisco ASR 1004.

12.44.44.44 is out internet provider. We have four internet facing routers and they all have the same prefix-list applied. Can't figure out what it actually does.

ip prefix-list CLASSA-ONLY seq 5 permit 0.0.0.0/0 le 8

ip prefix-list CLASSA-ONLY seq 10 permit 0.0.0.0/0 le 12

ip prefix-list CLASSA-ONLY seq 20 permit 0.0.0.0/0 le 14

router bgp 65000

address-family ipv4

neighbor 12.44.44.44 prefix-list CLASSA-ONLY in