xUmp.com Logo

Single Celt Rattleback - Pick Your Color - Image One
Share this product:
Toys & Gifts > Science Desktop Gadgets and Toys

Single Celt Rattleback - Pick Your Color

Item#: 17204   4.5 star rating 2 customer reviews
Price: $1.39 /each
$1.29 /each (buy 10+)
$1.19 /each (buy 100+)
IN STOCK Ships in 1-2 work days
from our Lakewood, CA warehouse.
Add to cart to see shipping cost.

We have 300 pcs in stock.

A celt or rattleback is one of the most fascinating physics toys!

It is a long, thin, half-elliptical shape formed in plastic. It has a slightly offset center of gravity, which causes it to spin in a directional rotation of choice, usually counter-clockwise. Suppose you attempt to turn the celt or rattleback in the clockwise direction. In that case, strong preference will cause it to “rattle” back and forth after few rotations, stopping and then reversing the course back to the preferred counter-clockwise direction. Also, if you push down on one of its ends from rest, it will begin spinning.

Rattlebacks make a great desk toy and conversation starter.


  • Single rattleback - pick your desired color!
  • Fun toy with mysterious spin-reversal motion
  • Behaves in seemingly opposite ways when spun clockwise versus counter-clockwise
  • Excellent for physics demonstrations or as an exciting desk toy

14 +
Approx. Ship Size:
4.00 x 0.75 x 0.50 inches
10.16cm x 1.91cm x 1.27cm
0 lb 1 oz
0.01 kg

Small parts. Not for children under 3 yrs.

Customer Reviews

5 star rating  Rattlebacks rule
Mr. Upright from USA TX Katy
Rattlebacks are great for demonstrations and for finding the volume of an irregular solid through displacement.

4 star rating  Cool Fidget Toy
Eric from Ontario
Although it does not do very much, it is quite pretty and very inexpensive.

xUmp.com Logo

Join our tribe:
At xUmp.com, we are passionate about science. We believe in hands-on learning and making science fun. - Anton Skorucak, Physicist and Founder

Welcome to xUmp.com, your one-stop shop for all your scientific and STEM needs! Our extensive selection of science supplies has been carefully curated by real scientists and educators, ensuring that you'll find only the best and most educational products on our site. Whether you're a teacher looking for classroom supplies, a student gearing up for a science fair, or a science enthusiast looking for the perfect gift, we've got you covered. From chemistry glassware and lab equipment to robots and science kits, we have everything you need to explore the exciting world of science. Browse our store today and discover the wonder of science!