DeMarini 2025 Zenith (-13) Fastpitch Softball Bat - 30"/17 oz Big D End Cap: Helps to absorb vibration so hitters can swing with confidence DX1 Alloy Barrel: High strength alloy built for performance and durability Half + Half Construction: A continuation of DeMarini's innovative technology, this pairs a composite handle and alloy barrel for a stiff and powerful swing.