The device tested was called the Runt II design; it was reportedly very similar to the Runt design tested in Castle Romeo, other than the enrichment level.

The EC24 bomb was a limited production run of the Castle Yankee test device, with 10 produced and stockpiled through 1954.

The production model Mark 24 nuclear bomb was 61.4 by 296 inches (1.56 by 7.52 m) long, with a weight between 41,000 and 42,000 pounds (18,600 and 19,100 kg).

This process inserted the weapon's pit into the implosion assembly.

[1] A Mark 24 casing is on display in the Castle Air Museum in Atwater, CA.