In every product description, the bleed size and safe zone requirement are listed. Each product may differ.
To make it simple, a bleed is the extra margin on print materials that is meant to be trimmed off when the product is trimmed to its final size. It literally means that the color and graphics on a product will “bleed off the page” so that when your image reaches the edge, it won’t leave any unwanted white edges.
1.5mm on each side
If you actual product size is 89mm x 54mm,
you will need to add the bleed size (1.5mm on each side):
The safe zone is the area where all the most important, critical elements (such as text, images, logos, etc) are placed. Making sure they are within the safe zone is the only way to avoid these elements from being trimmed off once the product is trimmed to the final size.
If you actual product size is 89mm x 54mm, the safe zone (4mm away from each side) shall be: