i thought the entire purpose was to stay in motion until stopped . do they stop on their own?

yes, they will do stop on their own after 50-60 seconds

Does this thing get rusted?

No. We have had ours for a few years now and it is still in like new condition. No rust

What is the length? The title states 11" while the product descriptions specifies 9".

The length of the marble base is 9.06 inches, the width is 6.69 inches, and the diagonal length of the marble base is about 11 inches.

we had one before from a mall and the balls were tangled so we couldn't use it does this one have the balls where they don't tangle ?

The one I ordered through Amazon was packaged very carefully with each ball and string wrapped in plastic. The strings were not tangled. The unit has not tangled; the balls are heavy weight and seem to be good quality. I am sorry that you had that experience. I enjoy the cradle so much; it is intriguing.

Cerropi Large Newtons Cradle Pendulum With 7 Balls Physics Perpetual

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Description

⚡ Swing into focus with timeless physics and sleek design!

GIFT READY WITH CARE - Individually wrapped, shockproof packaging plus a 1-year warranty ensures a flawless unboxing and lasting satisfaction.
SLEEK NATURAL ELEGANCE - Beech wood base adds a refined, minimalist aesthetic perfect for any modern office or creative space.
ENDLESS MOMENTUM MASTERY - Experience mesmerizing 50+ seconds of smooth, perpetual motion that captivates and calms.
PREMIUM INDUSTRIAL STRENGTH - Crafted with 8mm chromed steel bars and 20mm steel balls for durability that lasts through countless swings.
STRESS RELIEF MEETS SCIENCE - A sophisticated desk toy that doubles as a calming fidget and an intuitive physics teaching aid.

The CERROPI Large Newton's Cradle features 7 perfectly aligned steel balls suspended on 8mm chromed metal bars with a stylish beech wood base. Designed for over 50 seconds of smooth swing time, it demonstrates momentum and energy conservation while serving as a premium desk toy and stress-reliever. Its durable construction, elegant packaging, and included extras make it an ideal gift and educational tool for professionals and science enthusiasts alike.

Specifications

ASIN	B07Y5S5YWR
Age Range Description	Adult/Kid
Best Sellers Rank	#17,425 in Toys & Games ( See Top 100 in Toys & Games ) #169 in Educational Science Kits
Brand Name	CERROPI
Color	Silver
Customer Reviews	4.5 out of 5 stars 772 Reviews
Educational Objective	Logical Thinking
Global Trade Identification Number	00715668926103
Included Components	1PC Newtons Cradle
Indoor Outdoor Usage	Indoor
Item Dimensions	9.06 x 6.69 x 6.69 inches
Item Type Name	science-kits
Item Weight	1200 g
Manufacturer	CERROPI
Manufacturer Part Number	2057
Manufacturer Warranty Description	60 Day Warranty Against Manufacturer Defects
Manufacturer recommended age	5 years and up
Material Type	Nylon, Steel, Wood
Model Number	2057
Number of Packs	1
Number of Players	1
Operation Mode	Manual
Power Source	Manual
Set Name	Newton's Cradle with 7 Balls
Size	Large
Supported Battery Types	No batteries required
Theme	Physics
UPC	715668926103
Unit Count	1 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Fantastic experience overall. Will recommend to friends and family.

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€ 146.57

Duties & taxes included

In stock

Sold byAmazon NetherlandsDelivered 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 Netherlands.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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CERROPI Large Newtons Cradle Pendulum with 7 Balls, Physics Perpetual Motion Desk Toys for Office, Calm Down Fidgets, 50+ Sec Swingtime (Beech Base)

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