Duplex is a special bloon property of normal and regrowers and not for super regrowers, Everytime a duplex bloon is popped it releases x2 below rank of it (i.e. Ceramic bloon with Duplex effect drops 2 rainbow bloons instead of 1), A bloon that has a Duplex effect has a pulsating effect on it, Appears sometimes on round 20 and officially appears at round 60+. Note: Duplex can affect Blimps too (1 Moab = 8 Ceramics) (1 BFB = 8 Moabs and so on).