1. Flashing after hitting.
2. Multilayer constructions.
3. A superbright LED embedded inside.
4. Du-pont surlyn cut proof cover.
5. Battery life: about 30 hours for red ball, about 20 hour for blue and green.
1. Weight: 44g. 2. Diameter: 42.8mm. 3. Wind tunnel: 421. 4. Flashing for 6 minuers after hitting. 5. Battery: 3V.