The phisical specifications for these 3 denominations have changed, they are now Lighter and thinner:

25 kuruş:
Weight: 2.9 g (previuosly 4.0 g)
Thickness: 1.1 mm (previuosly 1.5 mm)

50 kuruş:
Weight: 5.5 g (previuosly 6.8 g)
Thickness: 1.5 mm (previuosly 2.0 mm)

1 lira:
Weight: 6.6 g (previuosly 8.2 g)
Thickness: 1.5 mm (previuosly 2.0 mm)

(news from Jo Hoogeveen)
(image from Delcampe seller doc4710)