 This version is a variation of Fregat-M with a block of drop-off tanks ("SBB" or Сбрасываемый Блок Баков in Russian) which makes increased payload capability possible.The torus-shaped SBB weighs and contains up to of propellant.The total dry weight of the Fregat-SB (including SBB) is and the maximum propellant carrying capacity is .