1. Metal power ball with counter; aluminum case and zinc alloy ball core; rubber ring to imprint or engrave logo. 2. The size is 7.7cm(dia)*6.0cm(height). 3. It´s durable and portable. It´s good for health. 4. Your logo is available. We also have other types for your choice. We can do w/o speedometer and reoffer quotation. 5. The random sample fee is $100(including express fee $30). The mould fee depends on your design.