For the 15mm models: Molotow One4all 627HS, 660PI and 620PP, Molotow Chalk, Munhwa Paint and Blackboard, and Zeyar Paint (15mm tips). For the 30mm LogoRolly 3.0: Molotow 613TF (30mm). Other markers with matching tip sizes may work, but these are the ones we've tested and stand behind.For the 0.6" models: Molotow One4all 627HS, 660PI and 620PP, Molotow Chalk, Munhwa Paint and Blackboard, and Zeyar Paint (0.6" tips). For the 1.2" LogoRolly 3.0: Molotow 613TF (1.2"). Other markers with matching tip sizes may work, but these are the ones we've tested and stand behind.