Kewlus DIY Cobra Bag Spring (KS2)

Kewlus DIY Cobra Bag Spring (KS2)

Regular price ₩42,000 KRW
Regular price Sale price ₩42,000 KRW
Sale Sold out

Save a ton of money by making your own DIY Boxing Cobra Punching Bag with the KS2 Cobra Bag Spring. Increase the speed to your liking, yes with the KS2 the 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.

Limited Time Offer: Get 50% Off

Use the code REEDYKEWLUS at the checkout to get 50% off the KS2 Spring! This is a limited time discount and is limited to one per customer.

DIY Instructions

For complete DIY build instructions including a video using the Kewlus PRO Spring, click here.

Cobra Punching Bag DIY

Reviews & Build by Others

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:

Here's a video of the spring in action (DIY bottom section and base) posted by a customer:

KS2 vs KS3 Springs Compared

Check out this article to read about the differences between the KS2 Spring and the KS3 Spring, or watch this video:

 

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 & Canada 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.

Tracking 

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.

View full details

Customer Reviews

Based on 26 reviews
85%
(22)
4%
(1)
4%
(1)
0%
(0)
8%
(2)
J
James c.
KEWLUS DIY COBRA KS2 BAG

REEDY, SPRING WORKS PERFECTLY. i HAVE MADE 2 STRIKING BAGS , MINE LOOKS JUST LIKE YOURS IN YOUR VIDEOS.ONLY DIFFERENCE I USED 4 45LB BAG OF SAND AT BASE. THANKS FOR ALL YOUR GREAT VIDEOS,MATE.

S
Scott B.
Great DIY boxing guides and products.

Love my Kewlis spring cobra bag! Great return speed! Makes for a fast bag.

M
Maheer I.
Kewlus pro spring

I ordered this spring after wanting it for so long. I really enjoyed making the cobra bag the spring is great, it's sturdy and high quality. Not much else to say just a great piece of equipment. Very pleased. For only 50 bucks u won't regret.

D
Darren B.
Awesome

The spring is what makes or breaks the cobra bag. The KS2 spring performs amazingly and will give you an even better workout to practice your timing and precision!

R
Roberto R.

Thank you I got the spring and it’s awesome and works great

L
Luis M.
Exceptional Quality & Easy to Install - Don't Overthink It & Get It!

Recently a cobra-bag I bought at a yard sale broke, so finding one that wasn't too expensive was near impossible. However I came across some YouTube reviews about this Kewlus Spring & for $30 I thought it was worth checking it out. Well its been 2 weeks now & I haven't stopped training with it! I got some supplies from Home Depot, followed Kewlus's DIY instructions, and boom I got a new Cobra bag for under $100 lol. The spring is very firm, its diameter is also perfect for fitting it on a PVC pipe (which is very cheap to purchase), and can take any amount of combos you throw at it.

I also want to add that the delivery-experience was extremely transparent: You could track the shipment of your purchase in real-time & it came pretty fast. I