Alternative to pouring concrete for your bullpen string setup.  Or using toilet plungers and string.  The Portable Bullpen Strings include 2 premium base frames, 2 posts with 8 set heights at 10, 15, 20, 25, 30, 35, 40, 45".  Bungee paracord and D-Rings included.  Similar setups often seen during Spring Training.  Helps for catcher framing.  Also can be used for pitch tunneling if set between the pitcher and home plate.

INCLUDED:

1.    Strike zone rectangle
2.   Side strings:  black
3.   S-Biners (4) 
4.   Spring cord locks (4)
5.   Steel posts (2)
6.   Base frame (2)
7.   Bolts and lock washers (2)