Vortex Gravity Defying Coin Bank, Watch Money Defy Gravity Circling Around When Saving Loose Coins

Would this work for marbles?

what marerial is it made of?

What are the dimensions of the product. Description says 14 x 7 x 7 inches. Is that 14" from bottom to the top of the coin ramp or to the vortex top?

Ours came without the screws - what size are they, so I can purchase 4 of them from the hardware store?