Hollow Pots for slab construction available in different sizes:
> 6" (400*200*150)- sh. 80
> 8" (400*200*200)- sh. 95
> 9" (400*200*230)- sh. 100
> 12" (380*200*300)- sh. 110
They are cheaper than solid slab, light weight, sound proof and provide ready passage for electrical and plumbing works.