Retrospec Luna Exercise Ball with Pump – Anti-Burst Fitness Equipment for Yoga, Core Training & Stability – Home Gym Swiss Ball for Office & Pregnancy

Customers find the exercise ball well-made, easy to assemble and use, with a nice matte black finish and good functionality, particularly for pregnant women. The ball is easy to pump up, and one customer mentions it works well as a desk chair. While some customers say it stays inflated, others report it rapidly loses air during use. The size receives mixed feedback, with some loving it while others find it doesn't fit their needs, and durability is also mixed, with some reporting it bursts within four months of use.