This base set includes

-43 Different Designs

-seven 25mm square, four 25mm x 50mm rectangle, four 30mm square, four 30mm x 60mm rectangle, seven 40mm square, three 40mm x 60mm rectangle, four 50mm square, four 50mm x 75mm rectangle, two 50mm x 100mm rectangle, three 60mm x 100mm rectangle, one 100mm x 150mm rectangle.

-5 different versions of each base
-Base Toppers
-Flat versions
-Flat versions with supports
-Magnet holes for 5mm x 1mm magnets
-Magnet holes with supports