Official Practice Adapter for "Blade Bottle Battle," a martial art using PET bottles / Set of 10 Black (Free Shipping). A grip that allows for safe practice, popular at Kobe events. ■ Contents • Quantity: 10 pieces (Black) • Condition: New / Unused • Shipping: Yu-Packet Plus (includes packing fee, with tracking) / Usually ships within 1-2 days ■ Featured Information Also featured in the Mainichi Shimbun (search for the article "Instead of a sword... PET bottles: Self-defense techniques that beginners can easily learn"). ■ Specifications/Points • Total Length: Approximately 10cm (actual measurement) • Usage: Attach to commercially available PET bottles and use as a knife. • Manufacturing: 3D printer molding (mass-produced 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 PET bottle sizes (500ml, etc.). ■ Important Notes • This product is for practice only. Strong impacts against 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 a face guard and gloves during practice. • For higher 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/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 the agreement of both parties). Please contact us as soon as possible (guideline: within 72 hours of arrival). ■ Disclaimer The seller is not responsible for any accidents or damages resulting from the use of this adapter. Use is at your own risk, and please follow the precautions and practice in a safe environment.