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Bells of Steel (B.o.S.) Pro Grade Competition Kettlebells
Bells of Steel (B.o.S.) Pro Grade Competition Kettlebells Bells of Steel (B.o.S.) Pro Grade Competition Kettlebells

Payment plan available with Flexiti (select during checkout).

Payment plan available with Flexiti (select during checkout).


Bells of Steel Pro Grade Competition Kettlebells

We have perfected the is why B.o.S. are different from the others.....

The result is a unique single piece gravity cast system that provides a smoother, weld free surface and superior dimensional accuracy. Why is this important, a kettlebell is pretty simple, right? Well after seven years of doing this, B.o.S owner, Kaevon, has seen a lot of bad kettlebells. Casting bells as a single piece isn’t a standard in the industry, with many factories out there attaching the handle post production. This design can cause the handle to wobble, or even completely break off. That’s why all B.o.S. Kettlebells are single cast, where molten iron/steel is poured into a mold made of compacted sand.

For our perfect pro grade competition kettlebells, B.o.S. takes this a step further by using a dual cast system, with an outer mold of a standardized size and an inner mold that, depending on the weight the kettlebell is selected to be, the inner mold becomes larger or smaller.


A hollow core design that means you’ll never have to deal with kettlebell rattle and they’ll last a lifetime.

All of our kettlebells meet international competition standards and carry a lifetime warranty. The bells are thoroughly inspected post production to ensure our bells are the absolute highest quality and I (Kaevon, the owner) often visit the factory myself to ensure standards are being met.

 Perfect Pro Grade Kettlebells are the best style of kettlebells you can buy.

Also known as competition kettlebells, these kettle bells are perfect for any kettlebell workout. Originally designed for use in Kettlebell Sport (or GS, short for Girevoy Sport), they are now commonplace in gyms across the country. Here’s why B.o.S. perfect pro grades are the best kettlebells you can buy:

Window size
On bells from 10KG – 32kg and the 48kg the window is 60mm, creating an easier insertion and superior comfort in the overhead and in the rack position. The more comfortable you ae the more reps you will be able to pump out. Though a 60mm window is superior for those with kettlebell experience, the 4, 6 and 8KG bells have a 58mm window, which is optimal for those new to kettlebells.

On bells from 10KG – 32kg and the 48kg have a 35mm diameter handle which is the international standard. The larger circumference will also reduce the risk of hand tears by creating a larger surface area to press on and for experienced athletes to relax their gip, whereas on a 33mm handle people have a tendency to squeeze too hard. On the starter bells 4, 6 and 8kg they have a 33mm handle to help beginners get adjusted to using the kettlebell before they progress to competition sizes.

Awesome Quality
Perfect pro grades are gravity cast as one piece and have no welding, which creates an excellent surface finish and superior dimensional accuracy. They will last you a lifetime.

Legal for Kettlebell Sport competitions
Meets Girevoy Sport Union (GSU), IKFF and International Union of Kettlebell Lifting (IUKL) standards.

Hollow Core
Using a dual cast process, two moulds are used to create the kettlebell leaving it hollow in the middle. This make for an unbeatable balance as well as never having the dreaded “kettle rattle” you can get in bells that have scrap metal welded inside that can come loose after many drops.

Ergonomic design
Of this kettlebell has been optimized to allow the athlete (a Girevik) to perform the maximum amount of repetitions in a competition. The shape of the bell makes it more comfortable when performing kettlebell exercises like the kettlebell swing. The design of the competition kettlebell also helps to prevent injury.

Uniform size
Regardless of weight, so you don’t have to continuously adjust your lifting technique as you move up in weight.

Colour coded
So you always know which kettlebell is which.

Because of the hollow cast system, 4, 6 and 34-46kg have 33mm handles and are not hollow core.

Warranty: Lifetime