ZETT Junior Soft Metal Baseball Bat Double Power Model Number: BAT71000 Length: 80cm Outer Diameter: 68mm Weight: Average 580 grams Balance: Top Balance Color: Black The core is a double-tube structure, producing an astonishing repulsive force that is incomparable to other metal bats. I hit a lot of home runs with this bat! The grip tape is Iomic. Regarding shipping, it will be sent with simple packaging. Material...Metal Equipment regulations compliant...Softball Baseball