They are the most bad safe method of investing savings, because the Treasury with all your majakiem ensures that within a certain period receive interest and the bonds will be redeemed (we will refund).
There are four main types of Treasury bonds, emitted by the Ministry of Finance:
Treasury bond 4 year and
4-year Treasury bonds in the first year have an interest rate of 3.5%, and in subsequent years the interest rate is determined by increasing the inflation index margin of 1.25 percentage points.
In the first year is 4%, after this the indicator of inflation plus a margin of 1.5%.
Interest rates of Treasury bonds amid the usual suggestions of Bank deposits (the second is the safest way to increase capital) wybada profitable, but to freeze the savings for 10 years may cause some doubts, but not to worry, because unlike deposits we can at any time to refuse without losing earned interest.