Choice set of 3 (without 15cm) or set of 4. 
Each box is 90cm long X 75cm wide
Heights are 15cm-30cm-45cm-60cm.
Designed to work individually or together as a set and can be stacked together. 
The boxes are attached together with strong Velcro straps to help ensure safety during use.
 
Two Types of Filling avaliable:
 
EPE Filling
15cm - 7LBS
30cm - 13 LBS
45cm - 17 LBS
60cm - 21LB
 
High Strength foam + EPE filling                                    
15cm - 28.65LBS
30cm - 32.63LBS 
45cm - 37.80LBS 
60cm - 42.2LBS  
 
High Strength Foam Filler proviode extra support & durability.