Official Practice Adapter for "Blade Bottle Battle," a martial art using plastic bottles / Set of 10 Gray (Free Shipping). A grip that allows for safe practice, popular at Kobe events. ■ Contents • Quantity: 10 pieces (Gray) • Condition: New / Unused • Shipping: Yu-Packet Plus (including packing fee, with tracking) / Usually ships within 1-2 days ■ Featured Information Also introduced in the Mainichi Shimbun (search for the article "Instead of a sword... plastic bottles: A self-defense technique designed for beginners to easily learn"). ■ Specifications and Points • Total Length: Approximately 10cm (actual measurement) • Usage: Attach to commercially available plastic bottles and use them as knives. Suitable for practice swings, form confirmation, and receiving techniques. • Manufacturing: 3D printer molding (mass production for home use) • Material: PLA+ (Improved PLA) — Has improved toughness and impact resistance compared to regular PLA, but has limitations with heat, UV rays, and strong impacts. • Structure: Cushion design with air holes at the bottom. • Compatibility: Compatible with standard Japanese plastic bottle sizes (500ml, etc.). ■ Caution • This product is for practice only. Strong impacts on hard surfaces, dropping from high places, and prolonged exposure to direct sunlight or high temperatures (e.g., inside a car) can cause deformation or damage. • PLA materials generally soften at 50-65°C, so avoid storing them in direct sunlight or high temperatures. • 3D printed products have weaknesses in the layer direction, so they are not suitable for applications that involve repeated strong stress. • Always wear protective gear such as gloves during practice. • For high durability, we recommend the higher-end model made of PA12 (a high-durability resin used in the aviation and industrial fields). The higher-end model is available at the online shop "BBB Official Adapter Specialty Store." ■ Initial Defects and Returns If there is obvious damage upon arrival or if it significantly differs from the description, please contact us via transaction message before giving a rating. Please send photos (overall, damaged parts, and packaging), and we will discuss exchange, refund, or return (returns will be carried out with mutual agreement). Please contact us as soon as possible (within 72 hours of arrival is a guideline). ■ Disclaimer The seller is not responsible for any accidents or damages resulting from the use of this adapter. Use at your own risk, and follow the precautions in a safe environment.