"Rounds" are usually one troy ounce coins made as bullion items. Traditionally they were made of silver or gold, but recently copper rounds have appeared. They are made either for people who want to own precious metals or for collectors.

Silver, 38 mm, 31.60 gm
Obverse:
Indian head facing right
LIBERTY / 2009
Reverse:
Buffalo facing left
UNITED STATES OF AMERICA / E PLURIBUS UNUM
1 OZ .999 FINE SILVER

This item uses the design of the United States "Buffalo nickel" or five cent coin.

Silver, 38 mm, 31.10 gm
Obverse:
Balance scales
ONE TROY OUNCE / 31.1 GRAMS / 999 FINE SILVER / SILVER TRADE UNIT
Reverse:
Eagle holding flag, 8 stars, wreath

Silver, 39 mm, 33.15 gm
Obverse:
Millard Fillmore facing 1/4 right
MILLARD FILLMORE
1850 1853
13th PRESIDENT OF THE UNITED STATES
Reverse:
Eagle and shield
MILLARD FILLMORE
BORN JAN 7, 1800
MARRIED ABIGAIL POWERS 1826 / CAROLINE McINTOSH 1858
LAST WHIG PRESIDENT, / OPENED TRADE WITH JAPAN,
INSTALLED FIRST LIBRARY IN WHITE HOUSE.
DIED MAR. 8, 1874
STERLING

Silver, 40 mm, 62.68 gm, 5 mm thick
Obverse:
Cleopatra seated, Eye of Horus, Egyptian hieroglyphics
Reverse:
Pyramid, goddess Isis as woman with eagle wings spread, Egyptian hieroglyphics
Lettering underneath: 2OZ / 999 / Ag

Silver, 39 mm, 62.36 gm, 5 mm thick
Obverse:
Minerva facing left
UNITED STATES OF AMERICA / TWO TROY OUNCES
IN GOD WE TRUST / MCMXV
Reverse:
Horned Owl facing left sitting on pine tree branch
PANAMA-PACIFIC EXPOSITION / SAN FRANCISCO
E PLURIBUS UNUM
.999 FINE AG

The design is based on the United States Commemorative $50 gold coins issued for the 1915 San Francisco Panama-Pacific International Exposition.

Copper, 38 mm, 28.78 gm
Obverse:
Indian head facing left
LIBERTY / 1929
Reverse:
Eagle facing left
GOLDEN STATE MINT
E PLURIBUS UNUM
IN GOD WE TRUST
1 OUNCE .999 FINE COPPER

The design is based on the United States Indian Head $5 gold coin issued from 1908 to 1929.

Copper, 38 mm, 29.07 gm
Obverse:
John F. Kennedy facing left
LIBERTY
IN GOD WE TRUST
1964
Reverse:
Eagle and shield
COPPER.999 FINE / USA
ONE A.V.D.P. OUNCE (Avoirdupois)

The obverse design is based on the obverse of the United States Kennedy Half Dollar of 1964.
The reverse design is based on the reverse of the United States Liberty Seated coins.