In India, security details are provided to some high-risk individuals by the police and local government. Depending on the threat perception to the person, the category is divided into four tiers: Z+ (highest level), Z, Y and X.
Individuals under the security blanket include the President, Vice-President, Prime-Minister, Supreme Court & High Court Judges, Governors of State, Chief Ministers and Cabinet Ministers.

SPG category – Strength of security detail is Classified
Z+ category has a security cover of 36 personnel
Z category has a security cover of 22 personnel
Y category has a security cover of 11 personnel
X category has a security cover of 2 personnel

Source: http://en.wikipedia.org/wiki/Security_categories_in_India