Nursing care insurance (Pflegeversicherung) is something you pay when you have public health insurance in Germany.
If you are under 23 years old, or you have children, it costs 3.05% of your income. If you are over 22 years old, and you don't have children, it costs 3.4% of your income. If you earn more than 58,050€ per year, you pay the maximum amount: 3.05% or 3.4% of 58,050€.
When you are an employee, your employer pays half of your Pflegeversicherung.
If you have private health insurance, Pflegeversicherung is part of your insurance policy.