This is a A6-sized sticker sheet with 40 stickers illustrated by Jemina Linnama (Sinikara Stationery).
The stickers are printed on a semi-matte removable sticker paper. The maximum width of the stickers is a bit under 1.5 inches so that they will fit in the Happy Planner and Erin Condren boxes nicely. All the half boxes and other box-type stickers are always 1.5 inches wide.
The actual sticker sheets don't have a grey background as shown in the mock-up pictures. The grey background is only used to show you how the stickers are kiss-cut.