[Special note]: The 3D board can be selected without glue or self-adhesive. If you buy it without glue, you need to prepare glue yourself. All-purpose glue, glass glue, and double-sided glue are OK. [Customized self-adhesive] the back can be pasted after 3m double side tape is torn off. It needs to be pasted manually. It will be delivered in 2-3 days, not by machine operation, so it is relatively slow! [Self-provided tools]: (ruler, pencil, woodworking cutter or scissors are all selected, no need to prepare without cutting), white caulking glue (for filling gaps) [Installation method without glue]: if you paste all-purpose glue in a can, apply the wall to be pasted first, and apply the back of the board, when the glue is dry, it will not stick to the hand and then stick it on the wall. If you feel that gluing is troublesome, you can use glass glue nail-free glue, directly press it on the back, and stick it after a few minutes ~ [gap treatment]: all blocks and blocks will have small gaps, it can be ignored. It is the same as the tile splicing principle. If you worry about affecting the appearance, you can reserve a spacing of 1 to 2mm between the block and the block when installing, and fill it with white caulking glue later.