# PORTENTUM Resistance Bands Kit, 12 Pieces, 4.5-22.5kg Tubes

Source: https://www.ranked10.co.uk/fitness/best-resistance-bands/portentum-12-piece-kit
Ranked #5 in "Best Resistance Bands 2026: 10 Ranked on What the Pounds Mean": https://www.ranked10.co.uk/fitness/best-resistance-bands

- Price: £20.53 (checked on Amazon UK on 2026-09-14)
- Amazon rating: 4.6 from 3,625 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0BR8JHGSP?tag=ranked10-21

The PORTENTUM kit is the only listing in this ranking that publishes its five tubes in both systems, and converts them correctly: 4.5, 9, 13.5, 18 and 22.5 kg, which are exactly 10, 20, 30, 40 and 50 lb. Where the COFOF sells the same kind of kit on a single headline figure of 150lb, this page shows the arithmetic that produces it.

The kit itself is twelve pieces: five tubes, two handles, two ankle straps, a door anchor, a bag and a manual, at £20.53 with 3,625 ratings at 4.6. The claim to treat with care is the warranty. A ten-year guarantee on natural elastic is a marketing position rather than a maintenance programme: rubber loses elasticity to oxidation and light whether you use it or not.

## Specification

| Field | Value |
|---|---|
| Price at collection | £20.53 for twelve pieces |
| Ratings | 4.6 from 3,625 |
| Distribution | 72 per cent five-star, 18 per cent four |
| Tubes in both systems | 4.5 / 9 / 13.5 / 18 / 22.5 kg = 10 / 20 / 30 / 40 / 50 lb |
| Included | Five tubes, two handles, two ankle straps, door anchor, bag, manual |
| Set weight | 770 g |
| Warranty | 10 years, as published |
| Rank | 123rd in Resistance Bands on Amazon UK |

## Questions people ask

**What does the 150lb headline mean?**

It is the sum of all five tubes engaged at the same time, not the resistance of any one band. This listing is one of the few that publishes the individual figures so you can see the sum come together.

**How many pieces are in the kit?**

Twelve: five tubes, two handles, two ankle straps, a door anchor, a storage bag and a manual.

**Is the ten-year warranty realistic?**

Treat it as a marketing position. Natural rubber loses elasticity through oxidation and light whether it is used or not, so a decade of consistent performance is not something any elastic can promise.

**Does it include ankle straps?**

Yes, two of them, which is what makes the kit usable for leg work as well as upper body exercises.

**How is it rated?**

4.6 from 3,625 ratings, with seventy-two per cent at five stars — a large sample, though with a slightly higher share of four-star scores than the sets above it.