12 lb of plastic Gray pellets
They measure about 2.5-3.00 x 2.5mm
They slow sink in water.
Can be used for weighted blankets, dolls etc
Rock tumbling
As sand replacement in koi ponds and aquarium filters.
10 fl. oz cup of them weighs 7 oz
15 lbs make about 1/2 cub ft.
Might work in Cat genie litter boxes