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Rubber Ea
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10 ea Dumbbell Saddles Made of Tough Reinforced Nylon    US $50.00

Rubber Hex Dumbbells Set 2 10 LB Ea Gain Lean Muscle    US $35.00

New Pair Rubber Hex Dumbbells Chrome Handles 20 lbs ea    US $59.95

Rubber Hex Dumbbells Set 2 12 LB Ea Gain Lean Muscle    US $42.00

Rubber Hex Dumbbells Set of 2 8 LB Ea Gain Lean Muscle    US $28.00

New Pair Rubber Hex Dumbbells Chrome Handles 10 lbs ea    US $33.95

5 Pounds Pair 5lbs Chrome Dumbells Set Padded Grips Weights Gym Fitness Exercise    US $24.90

Neoprene Dumbbells 3 LB ea set of 2 Build muscle tone    US $9.00

Rubber Hex Dumbbells Set 2 15 LB Ea Gain Lean Muscle    US $52.50

Neoprene Dumbbells 10LB ea set of 2 Build muscle tone    US $36.00

Rubber Hex Dumbbells Set of 2 3 LB Ea Gain Lean Muscle    US $10.50

Rubber Hex Dumbbells Chrome Handles 12 lbs ea FREE SHIP    US $69.95

Why do different strings on an instrument make differents sounds?

I've made a homemade "guitar" for school by putting the same kind of rubber bands around a shoebox. I'm wondering why each string makes a different sound, even though they are exactly alike.

A few reasons:

1) They are not perfectly alike - they will have different elasticity and density, which will affect the frequency of vibration and the pitch.

2) They will be under differing amounts of strain (as they are stretched more/less)

3) The position of the bands along the box will affect the sound waves reflected back towards you