It is not recommended that someone does that. It will destroy their vehicle.
It's lightweight, only weighing just slightly more than 1 lb.
The Railroad chalk we carry does not stain or damage tires. It washes off easily with water.
The White Chalk is lightly coated for clean handling. When you mark, it comes out white as intended.
If you're out marking tires, it's used to hold an extra piece of chalk so you don't have to get your pocket dirty with chalk dust. It definitely comes in handy.
We have something called a Slot Boot that easily blocks off those unused spaces. We sell them in sets of 5.
The difference depends on how you will use the Chalk Stick. If you will be walking, a curved end is typically a better choice. If you are going to be in a cart, a straight end might be a little easier to use. But, really, it’s all about your preference.