I am a typical man beginning to work out my forearms. Approximately how many times will I be able to flex these consecutively?

about 50 to 100 each arm. a few times a day.

Are these appropriate for a nine year old boy?

I'm not sure what you mean by "appropriate". Will a 9 year old boy be able to use these? I don't see why not.

Are they made from plastic or metal inside? I had plastic and they didn't last very long.

Its plastic but its pretty durable. I've had mine for about 2 years, using 3-4x a week

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€ 60.37

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Netherlandsstore

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Great price for an authentic product. Fast international shipping too!

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Material	Foam
Brand	B01MXHXSNP
Style	Dumbell
Shape	Round
UPC	612032301231 612032301132
Global Trade Identification Number	00612032301132
Country of Origin	USA
Item model number	Esmartlife-01
ASIN	B01MXHXSNP

E-smartinlife Hand Grip Strengthener Set, Finger Gripper, Hand Grippers - Soft Foam Hand Exerciser for Quickly Increasing Wrist Forearm and Finger Strength, 2 Pack

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