About this item LARGER SIZE - The 22" diameter of the Dynamax Atlas is perfect for big power movements to build strength CONSTRUCTION - The soft-shell construction and balanced uniform weight make it easy to handle. The filler material provides even weight distribution and helps maintain shape WEIGHT OPTIONS - The Dynamax Atlas ball is comes in 4 weights, from 50 to 150 lbs DURABLE - The durable black casings are another great feature, as they will help your equipment stand up to repeated use. DYNAMAX - Dynamax delivers 25 years of research and development in every hand-made and superbly constructed product. MADE IN THE USA.