Across all three subtypes, the Capped Bust Half Eagles were struck with a composition of 91.67% gold and 8.33% silver and copper, as established under the Coinage Act of 1792.
The diameter of the pieces changed during the course of the series due to the adoption of the new minting technology. For the first two subtypes issued from 1807 to 1829, the diameter of the coins was 25 mm. For the third subtype issued from 1829 to 1834, the diameter was reduced to 23.8 mm. Regardless of diameter, all coins have a weight of 8.75 grams and a reeded edge.
Quality of striking for the series varies, but overall quality is typically good. Proof-like fields are often encountered and can be quite pleasing, although usually the luster will be satiny.