The Gold"s Gym 2lb Soft Weight Ball is suitable for using on its own with functional grip exercises to help tone and firm up the muscles in your arms, shoulders, back and abdomen. This soft weight ball includes an exercise guide to help you start a fitness regimen. Gold"s Gym 2lb Soft Weight Ball: * Vinyl covering * Sand filling for easy grip * Includes exercise guide * Dimensions: 4" round * Model# 05-0704GG