First of its kind, adjustable counterweight foam insert for 1.9" wheels.
Here is simple math for your wheel weight. Each brass slug weights 8.80 grams, 12 slugs max. for each foam, so there's over 105 grams ( 3.72 oz ) of weight max. for each wheel, so you can fine tune your rigs for the most difficult terrain.
Inner white foam features our most popular High Density Foam for extra weight and the most needed support on sidewall for greater side hilling performance.
Outer one are made from soft / black medium foam that easily conforms to the terrain to provides the maximum grip.
1.9 Dual Stage Foam x 2
Brass Slugs x 24