 The construction method allows a person to join pieces by using medium pressure, locking the blocks together with semi-rigid plastic pins which, unlike other brands, avoids the friction and wear between the pins and the internal surfaces of the blocks.This system avoids the fragility and instability in the models, giving a solidity unequaled by any other construction toy or block system.Rasti bricks produced in Argentina were made with quality in mind—the shafts were made in chromed steel with plastic points for joining the special holes in the wheels.