Odyssey Ai-One Jailbird Mini DB PutterProduct Information Key Features: Revolutionary A One Insert crafted from multiple materials with a milled Aluminum backer and White Hot Urethane striking surface, ensuring consistent ball speeds across the face and providing the classic White Hot feel. Ai window highlights the unique topology of the back of the insert. SL 90 shaft, a newly developed lightweight steel with 20 grams of counterbalancing, enhances performance. Unique Navy Blue PVD finish