Kewlus Cobra Bag Spring (KS2)

Kewlus Cobra Bag Spring (KS2)

Regular price $39.95 USD
Regular price $49.95 USD Sale price $39.95 USD
Sale Sold out

Make the ultimate and fastest Boxing Cobra Punching Bag with the Kewlus Cobra Bag Spring: the KS2. Increase the speed to your liking, yes speed is adjustable! This spring is designed to fit easily onto a 3/4 inch pipe and simply held in place with a butterfly hose clamp. Increase the speed by moving the spring lower onto the pipe, thus reducing the number of active coils.


Check out the cobra bag core kit and partial cobra bag kits that include this spring. Here's a video of the Top Section kit posted by a happy customer:

For DIY instructions on making your own base, check out

For complete DIY build instructions including a video using the Kewlus PRO Spring, go to

Cobra Punching Bag DIY

For more detailed and fully illustrated instructions get the Fighter DIY eBook (Third Edition. The Third Edition edition includes the Kewlus Spring Cobra Bag DIY plus 3 other awesome projects.

Review & Build by CSquared Boxing

Check out one of the top boxing gear reviewers on YouTube, Carlo Rosauro to see his hands on take on the spring as well as his full build 

Kewlus PRO Spring Review by CSquared Boxing

Shipping Info

Shipping is calculated at checkout with the following average shipping times.

USA & Canada

USA and Canadian orders will be shipped from Canada and takes just 2-3 days to most locations.

Limited Time Special Offer for USA customers: Orders to USA over $100 USD get free shipping.

Australia & NZ

Australian orders will be shipped from Queensland and takes just 2-3 days. NZ orders take 7-14 days.

The Rest of The World

All of the orders for the rest of the world are shipped from Canada and takes around 1 week to deliver.

Please note that you may need to pay import tax in some countries. Please check with your country's importation laws to find out how much tax would be charged.


You will receive an email with a tracking link as soon as your order is shipped from the warehouse. Please note that orders are not shipped on weekends or public holidays.

Pre-Ordering Products

Some products are available to pre-order and receive as soon as the are in stock. Please note that if you order these items together with other products, you whole order will not be shipped until every item in your order is available. All items in your order will be shipped together at the same time.

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