Exercise Balls: Silent Basketball w/ 90% Original Bounciness | 29.5? Indoor Basketball, NBA Size No.7, 12.7 Oz Airless Basketball: Foam Basketball Indoor, Silent Ball w/Genuine Grooves, Color is up for auction in Sports & Outdoors. The current bid is $5.50, 89% below the $50.00 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.