This piece of gear allows your feet to grip the surface of the skateboard and stay on it while doing flip tricks and riding the board. You can find them in a vast variety of colors and patterns so you can also personalize your board at your liking don't be afraid to try new things! it is regularly available in all black and also clear transparent (rarely used) but don't be shy! Go get the craziest one and stand out in the park! Remember that your board is part of your life and style and should represent you entirely!
You will not be able to skate properly or perform any tricks if you don't have one installed. Is sold in single sheets that are 9" X 33" but if you ride a longboard it could get to measure up to 12" X 4' so make sure that the one you get will cover the entire deck, although, some boards and people even decide to leave a blank spot in the center of the board or decide to shape it as the feel necessary just for the grip of the board and this is usually done in cruisers or longboards, some boards like penny boards do not have a need for grip tape since they are made out of plastic which has a pattern on the decks plastic body that is designed to provide you with the grip necessary.
You will need to peel off the bottom of the sheet, revealing a very sticky underside that will stick to the top of the skateboard deck.
Once you are able to set it use a box cutter or razor blade to cut your grip tape to fit your skateboard deck exactly. If you are new to this process we recommend you check out youtube tutorials or just ask the guy at your local skate shop to teach you how to do it! They will be more than happy to do so!