This 40 piece Soft Rocks Construction Set is made from PU and whilst they look like genuine heavy boulders, they are in fact the opposite. Soft and spongy to touch, safe, waterproof and so light they will float on water. A great resource to play with.

Set includes 40 Rocks (in 3 different shades): 

• 16 x small (14cmL x 12cmW x 9cmH, 
• 16 x medium 20cmL x 13cmW x 9cmH
• 8 x large (21cmL x 19cmW x 11cmH​
  
• A task guide book with stacking combinations.​
  

* Note: Image shows more than 40 rocks