This is a set of four optional wheel weight inserts for use with Axial 1.9 wheel weight rings (AXI30547). Each weight is 9grams/0.33oz.
Six of these weights are required to fully outfit the Axial weight rings. Of course, you can put it as many or as few of these weights in as you choose. If you wish to fully outfit two tires with these weights, you will need three of these packages.
Adding one wheel weight ring, plus six of these weights to that wheel, will add 3.48 ounces to your wheel. Multiple that by four wheels (13.94 ounces!) and you have a substantial amount of low CG weight.