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Mad Mattr Castle Building Set by Relevant Play


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Fulfilled by our friends at Relevant Play

MAD MATTR Castle Building Set - Stretch your creativity to the max….with Mad Mattr – the amazing, super-soft modeling compound that molds and builds incredibly easily. Mad Mattr is stretchy, flowy and incredibly tactile - press it, mold it, knead it, stretch it, squeeze it, squish it, sculpt it, shape it, build it! Stretch it slow and watch it flow. Mad Mattr is the super soft modelling compound, that molds and shapes easily! Because it doesn’t dry out and maintains its shape when compacted, Mad Mattr is perfect for building amazing creations and inspiring open-ended play! With the included castle molds, create your next castle with these fun molds. Build towers, stairs and stone walls around your castle. The castle set includes 8 plastic molds and tools for use with Mad Mattr. That's not it...This set also comes with colorful Mini Extruders that give minds of all ages a fun and creative way to learn about geometric shapes. Six (6) Mini Extruder shapes to choose from - Triangle, Hexagon, Cube, Star, Circle, House – you can stack, shape, stretch, and build endless, colorful 3D shapes.


  • Build it, stretch it, watch it flow!

  • Molds and shapes easily!

  • Super duper soft!

  • Reusable! Never dries out!

  • Easy to Clean Up

  • Wheat, Gluten and Casein-Free

  • Comes in a re-sealable storage pouch.

  • Available in 10 colors.

  • Build and create fun castles.
  • Creative ways to learn about geometric shapes.

Age Grade



  • 2 - 10oz Packs of Mad Mattr (1-Red, 1-Blue)

  • 1 - Castle Mold Set

  • 1 - Six shape extruder set

WARNING: Choking Hazard. Small Parts. Not for children under 5 years.