Difference between PU & SRF?

Bro both PU and SRF are better materials than other materials for punching bag, PU and SRF that doesn't cause lot's of difference in punching bag quality. You can choose bag according to your preference, in my opinion SRF material is value for money.

Can i put sand inside to make it heavier?

yes , but the condition is it should be unfilled.

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Amazon Brand - Symactive High Performance Heavy Duty 4 feet Filled Punching Bag with Rust Proof Stainless Steel Hanging Chain | SRF Material | for Boxing, MMA and Muay Thai | Black

Product ID: 534668118

Details

Size
4 ft
Sport
Boxing
Brand
Amazon Brand -
Colour
Black
Item Weight
14000 Grams

🔗rust-proof stainless steel chain

🥊4 ft heavy-duty size

🛡️durable double-stitched SRF material

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€ 524.55

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🥊 Elevate your fight game with pro-level power and durability!

PRO GRADE DIMENSIONS - A robust 4-foot length and 19kg weight deliver the ideal training size for serious athletes and beginners alike.
READY OUT OF THE BOX - Complete kit with filled bag and swivel chain ensures you can start training immediately—no extra purchases needed.
SWIFT SECURE SETUP - Includes rust-proof stainless steel hanging chain and heavy-duty d-shackles for hassle-free installation and long-lasting reliability.
ENGINEERED FOR ENDURANCE - Built with premium SRF outer layer and double-stitched seams to withstand the most intense boxing, MMA, and Muay Thai sessions.
OPTIMIZED IMPACT FEEDBACK - Filled with a perfectly balanced mix of sand and filler for smooth, realistic punching response every time.

The Amazon Brand - Symactive 4 ft Heavy Duty Punching Bag combines premium SRF synthetic rubber fiber construction with a balanced sand-filler core to deliver optimal impact feedback. Designed for boxing, MMA, and Muay Thai enthusiasts, it features rust-proof stainless steel hanging chains and reinforced double-stitched seams for unmatched durability. Weighing 19kg and ready to use out of the box, this bag is the #1 choice for serious training and beginners seeking professional-grade performance.

Specifications

ASIN	B0BZ8BMXX9
Age Range Description	Adult
Best Sellers Rank	#918 in Sports, Fitness & Outdoors ( See Top 100 in Sports, Fitness & Outdoors ) #5 in Boxing Heavy Bags
Brand	Amazon Brand - Symactive
Brand Name	Amazon Brand - Symactive
Colour	Black
Customer Reviews	3.9 out of 5 stars 1,115 Reviews
Importer Contact Information	Kushal Rubber Industries, BASTI BAWA KHEL, KAPURTHALA ROAD, JALANDHAR-144021, 97802 80717
Item Dimensions W x H	30W x 118H Centimeters
Item Type Name	PUNCHING BAG
Item Weight	19000 Grams
Manufacturer	Kushal Rubber Industries, Kushal Rubber Industries, BASTI BAWA KHEL, KAPURTHALA ROAD, JALANDHAR-144021, 97802 80717
Manufacturer Contact Information	Kushal Rubber Industries, BASTI BAWA KHEL, KAPURTHALA ROAD, JALANDHAR-144021, 97802 80717
Outer Material	Synthetic Rubber Fiber (SRF)
Outer Material Type	Synthetic Rubber Fiber (SRF)
Packer Contact Information	Kushal Rubber Industries, BASTI BAWA KHEL, KAPURTHALA ROAD, JALANDHAR-144021, 97802 80717
Size	4 ft
Sport	Boxing
Sport Type	Boxing
Unit Count	1 Count
Whats In The Box1 - Whats In The Box3	1 X 4 Feet Filled Punching Bag, 1 X Hanging Chain

Reviews

J**R

22.02.2026

D**R

5.02.2026

L**.

17.01.2024

V**N

31.12.2025

Y**J

28.02.2026

R**A

13.04.2026

S**I

10.12.2025

S**C

19.12.2025

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