Two cents. Bronze (97% copper, 2.5% zinc, 0.5% tin) with plain edges.  Shows New Zealand native kowhai flowers.
One cent.  Bronze (97% copper, 2.5% zinc, 0.5% tin) with plain edges.  Shows a fern leaf on one side, with Queen Elizabeth II on the other.
One and two cent coins were demonetised in 1990.
Five cents
Alloy: Cupro-nickel
Diameter: 19.43mm
Weight: 2.83g
Design: The last surviving member of an otherwise extinct family of reptiles, the tuatara, native only to New Zealand, is shown sitting on a coastal rock.
Ten cents
Alloy: Cupro-nickel
Diameter: 23.62mm
Weight: 5.66g
Design: A Maori carved head or koruru.
Twenty cents
Alloy: Cupro-nickel
Diameter: 28.58mm
Weight: 11.31g
Design: There are two designs currently in usage. A 20 cent piece featuring a Maori carving was released in 1990, when the kiwi motif was moved to the $1 coin.
Fifty cents
Alloy: Cupro-nickel
Diameter: 31.75mm
Weight: 13.61g
Design: The barque Endeavour, commanded by Captain Cook, sailing south, with Mount Taranaki (Egmont) in the distance.
New Zealand coins 1967 - present
On 10 July 1967, New Zealand currency changed over to decimal currency.
100cents = 1 dollar