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Quick Details

  • Subject: Physics
  • Brand Name: YOUSHANG
  • Model Number: IH194
  • Place of Origin: Zhejiang, China (Mainland)
  • Keyword: Ball
  • Material: Metal
  • Color: Black
  • Quality: High
  • Product name: Ball
  • Application: School
  • Type: Physics Instruments
  • Feature: Durable
  • Size: 25*13*4cm

Packaging & Delivery

Packaging Details 15 sets in a pack.
Delivery Time 20-30 days








Demonstrates expansion of metal with heat and its contraction when cooled. When the ball is



heated, it will not pass through the ring, but when both are the same temperature, the ball passes



through the ring freely. Brass Ball and Ring are mounted on a steel rod set into  wooden handles.











Q1:How to buy?

A1:Contact us to get T/T or PayPal account to make the payment.

Q2:What is your advantage?

A2:We always supply products with lower price and better quality.

Q3:How about the quality?

A3:We are the manufacturer with 10 years experience in producing educational apparatus and we can guarantee the quality of products is high and reliable.

Q4:When will I get the reply from seller?

A4:May delay 12 hours due to the time difference. We will reply you as soon as possible.

Q5:What can you do?

A5:We have our own design, and can also make customer’s design. You can send us the product details by email.



Transaction History of the Supplier

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Transaction Overview


Transaction Details

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China (Mainland) | Trading Company
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Supplier's Trade Assurance Limit: US $30,000
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