Everlast Core Reflex Bag Work on your fist speed, hand-eye coordination, and timing with the Everlast Core Reflex Bag. The large foam reflex ball and bottom mounted spring for beginner level rebound rates make this the perfect introductory reflex bag. Base is easily filled with sand or water to keep bag securely in place. Adjustable neck allows for customizable heights from 50.25" to 64. The foam padded neck offers additional punching protection while the bag is in motion. Start your timing your punches better with the Everlast Core Reflex Bag. FEATURES Large foam ball helps beginners refine their reflexes and speed. Bottom mount spring provides the optimal rebound. Foam padded neck provides extra protection when hitting a moving target. Two-piece base can be easily filled with sand or water to keep bag securely in place. Approximately 70lb when filled with water. Max setup height: 163cm. Engineered for: Endurance Reflex & Hand Eye Coordination.