Ironskull Fitness is known for its skull-shaped kettlebells. Patented in 2011, they were the first sculpted kettlebell to come to the market. Not only do they offer their classic skull design, but customers can also customize their own kettlebell by choosing their own paint design, or choosing from Ironskull Fitness’ existing paint options. There’s even the option to engrave the kettlebell play with a logo or lettering. Their kettlebells are made in the USA using high-quality iron castings which are poured in ISO-certified American foundries.