King George's pennies were produced in the same alloy as before until 1922, but the following year the composition of bronze coins was set at 95.5 percent copper, 3 percent tin, and 1.5 percent zinc, although the weight remained at and the diameter 1.2 inches (31 millimetres). This alloy was slightly more malleable; the lessened force needed to strike pennies helped minimise ghosting. No pennies were struck for the years 1923, 1924 or 1925; this was due to lack of demand as the interwar years saw alternating gluts and shortages of pennies. In 1928, the King's portrait was reduced in size, effectively eliminating the ghosting problem. The inscription around the three variations of the left-facing head remained GEORGIVS V DEI GRA BRITT OMN REX FID DEF IND IMP, while Britannia remained on the reverse, as before, though that design was slightly modified in 1922.