What material is this made of?

The bottom part is made of pretty hard plastic. The balls and the ball holder is made of stainless steel. Works perfectly for me and looks like it will last long.

Does it go on forever? Or like an hour?

An hour! You're an optimist. This thing is horrible. It goes for about 15 seconds. I'm returning it. I remember these things from way back when and they would go for much longer. I'd gladly spend twice as much for one that was decent, but this is a waste of time.

what are the stings made of?

They appear to be nylon fishing line

I am purchasing these for a hotel and need 420 units - what is availability?

As of 7 14 2023, we have over 700 pieces in stock ready to ship via Amazon.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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PowerTRC Newtons Cradle Balance Balls 7 1/4 inch

PowerTRC Newtons Cradle Balance Balls 7 1/4 inch

Product ID: 333599235

Details

Age range (description)
Kid
Brand
PowerTRC
Item dimensions L x W x H
20.3 x 18.4 x
Size
1 Count (Pack
Theme
Physics

🔄Smooth momentum transfer

⚖️7.25-inch precision balance

🛡️Durable stainless steel & sturdy plastic

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$73.78

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Swing into science — where style meets momentum!

DESK STATEMENT - Elevate your workspace with a sleek, reflective mirror finish that sparks curiosity.
GIFT OF GENIUS - A timeless present blending fun, learning, and style for all ages.
PHYSICS IN MOTION - Watch energy conservation and momentum come alive with every swing.
EDUCATIONAL ELEGANCE - Ideal for classrooms or home, turning complex science into captivating visual lessons.
STRESS RELIEF RITUAL - A meditative, calming gadget perfect for focus breaks and ADHD-friendly moments.

The PowerTRC Newtons Cradle Balance Balls is a 7.25-inch executive desk toy crafted from durable stainless steel and sturdy plastic. It visually demonstrates physics principles like energy conservation and momentum through smooth, mesmerizing ball swings. Perfect for office decor, educational use, and stress relief, it’s a stylish, interactive tool that appeals to science enthusiasts and professionals alike.

Specifications

ASIN	B00ZJH3ZP6
Age Range Description	Kid
Best Sellers Rank	#198,753 in Toys ( See Top 100 in Toys ) #2,557 in Educational Science Kits
Brand Name	PowerTRC
Customer Reviews	4.2 4.2 out of 5 stars (2,228)
Educational Objective	Physics
Is Assembly Required	No
Item Dimensions	20.3 x 18.4 x 12.7 centimeters
Item Weight	0.44 Kilograms
Manufacturer	PowerTRC
Manufacturer Maximum Age (MONTHS)	192.0
Manufacturer Part Number	B00ZJH3ZP6
Material Type	Metal
Model Number	SG_B00ZJH3ZP6_US
Size	1 Count (Pack of 1)
Theme	Physics
UPC	852093005871
Unit Count	1.0 Count

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$73.78

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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