According to Standard Catalog of World Coins by George S. Cuhaj (Krause Publications) these coins
New Zealand - 10 Cents - Elizabeth II 4th portrait - 2006-2017 - KM# 117a - Copper plated Steel – 3.30 g – ø 20.5 mm
https://en.numista.com/catalogue/pieces3297.html
New Zealand - 20 Cents - Elizabeth II 4th portrait - 2006-2017 - KM# 118a - Nickel plated Steel - 4.00 g - ø 21.75 mm
https://en.numista.com/catalogue/pieces2619.html
New Zealand - 50 Cents - Elizabeth II 4th portrait - 2006-2017 - KM# 119a - Nickel plated Steel - 5.00 g - ø 24.75 mm
https://en.numista.com/catalogue/pieces3927.html
must be split in two coins:
New Zealand - 10 Cents - Elizabeth II 4th portrait - 2006-2011 - KM# 117a - Copper plated Steel – 3.30 g – ø 20.5 mm
New Zealand - 10 Cents - Elizabeth II 4th portrait - 2010-2017 - KM# 117b - Copper – 3.73 g – ø 20.5 mm
New Zealand - 20 Cents - Elizabeth II 4th portrait - 2006-2009 - KM# 118a - Nickel plated Steel - 4.00 g - ø 21.75 mm
New Zealand - 20 Cents - Elizabeth II 4th portrait - 2010-2017 - KM# 118b - Copper-Nickel - 4.45g - ø 21.75 mm
New Zealand - 50 Cents - Elizabeth II 4th portrait - 2006-2009 - KM# 119a - Nickel plated Steel - 5.00 g - ø 24.75 mm
New Zealand - 50 Cents - Elizabeth II 4th portrait - 2010-2017 - KM# 119b - Copper-Nickel - 5.60 g - ø 24.75 mm