Features: The bowling ball workout tool is proper in size and light in weight, convenient to store and carry around. You can send the bowling accessories to your family members. They will feel your care and love. Specifications: Material: mainly aluminum Color: as the pictures shown Size: Original blade: about 3/5 inch in diameter Replacement blade: about 3/4 inch in diameter Package includes: 1 x Bowling ball workout tool 1 x Replacement blade Notes: Manual measurement, please allow slight errors on size. The color may exist slight difference due to different screen displays.