Why didn't we think of this before ?

Kettlestack kettlebells have always come in a wide range of sizes and weights.
Now, they come in even more sizes than weights
because we've come out with foam discs !
High quality "Yoga Mat" discs 1" thick and 8.5" in diameter

Big, puffy things that let you fill up your Kettlestack shape without adding weight.

Sold in sets of 4