US Bomb, 500 lb Practice, Mk 11
No fuzes are used in these bombs, and they contain no spotting charge, being filled either with water or with wet sand. The filling is usually stenciled on the body of the bomb. To prevent freezing and splitting of cases at high altitudes, anti-freeze is added. To improve spotting of hits, a spotting dye is also used.
Nothing else to see.
Collaborative Ordnance Data Repository