This seating furniture is tested and complies with relevant strength and durability standards. The tests simulate typical usage of the product and are based on use by persons weighing up to 110 kg.A maximum of 7 chairs can be stacked together.We recommend that the stackable furniture is lifted and moved one at a time.This seating furniture has been tested for public use and meets the requirements for safety, durability and stability set forth in the following standards: EN 16139-Level 1.