This set of books blocks are 20 mm thick; all sides & surfaces fully polished. specifications of 7 blocks as follows
.Rectangle 75 x 50 mm
Triangle 90º x 45º x 45º; 75 mm hypotenuse
Triangle 60ºx 60º x 60º; 57 mm side
Semicircle 75 mm diameter
Bi Convex 75 mm long, curved faces radius 115 mm
Bi Convex 75 mm long, curved faces radius 145 mm
Bi Concave 75 mm long, curved faces radius 115 mm
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