Parcel Dimensions:7 x 5.5 x 1.3 cm; 40 Grams Batteries Included?:No Item Weight:40 g Length: 5.0cm Dia of the screw part :4mm Material: Copper and plastic Weight: 120 grain Color: Yellow Note: This is not a toy, do Not shoot at people Package includes: 6 x Whistle arrow head FITS MOST ARROWS: Screw-in is a universal thread to fit today's aluminum and carbon arrow inserts. ARCHERY PRACTICING: Cooper Tip,makes Whistling Sound After Arrow Release from Your Bow. MAKE SIGNALS: It will appears a whooshing sound after shoot out COOL LOOKING: Great Colorway,Surface-Soldering makes a little bit Shiny under the Sunshine. Pretty Cool When you Take it Out. SERVICE GUARANTEE: We provide 100% money back guarantee if the product does not meet your satisfactory. See more product details FITS MOST ARROWS: Screw-in is a universal thread to fit today's aluminum and carbon arrow inserts. ARCHERY PRACTICING: Cooper Tip,makes Whistling Sound After Arrow Release from Your Bow. MAKE SIGNALS: It will appears a whooshing sound after shoot out COOL LOOKING: Great Colorway,Surface-Soldering makes a little bit Shiny under the Sunshine. Pretty Cool When you Take it Out. SERVICE GUARANTEE: We provide 100% money back guarantee if the product does not meet your satisfactory.