BerettaBig Game Hunting Sako x Tikka Opti-Lock Long Gun Scope Rings

dose the 30mm opticlock rings come as a pair Sako Optilock Rings 30mm / Medium, Blue S1300964

is it iron rings?

This is for a T3x light compact with a scope that will have a 44mm obj lens. Which is better the low or medium height ring?

Does this include the bases and rings?