All of the dummies listed are straight edged.
Simply Making Cake Dummy – Professional Straight Edge Cake Form for Cake Decorating, Fondant Icing, Modelling Chocolate – Smooth Polystyrene Block - Easy to Cut, Reusable (14" Square x 3" Deep)
Cake Dummy Round Straight Edge Polystyrene SET of FOUR 3", 4", 5" or 6" Depth
Cake Dummy Round Straight Edge Polystyrene 2 3 4 5 6 & 8 inch Depth - All Sizes
CAKE DUMMY STAR STRAIGHT EDGE POLYSTYRENE VARIOUSE SIZE, DEPTH AND SHAPE