Unique pitching rubber pairing each signed by a fan favorite and Hall of Famer. Collection includes one (1) Schutt youth pitching rubber (measures 4x18") with "LA" Dodgers sticker and a strong 9/10 Sandy Koufax signature in black and one (1) MLB regulation-size pitching rubber (6x24") signed by Mariano Rivera in blue. Sandy Koufax signature comes with JSA LOA and Cert attached; Mariano Rivera signature is very faded and comes with Steiner hologram attached.