Yes, you are allowed to get things engraved into a bowling ball. For example, you can get your name, last name or a nickname into the bowling ball. You can't get a picture engraved into a bowling ball because once it is engraved, it stay's that way. When you get a picture in a bowling ball, it takes away the purpose with the bowling ball.
The track of the ball is based on how you throw the ball. If your fingers stay in the ball longer after the thumb has released, the track can stay towards the high side. Sometimes the ball will jump more for high track bowlers.
A bowling ball
a bowling ball
A bowling ball is a ball that is used in the game of bowling, where you roll the ball down an aisle and try to knock down as many pins as you can.
The circumference of a bowling ball can not be increased.