Used on porous and non-porous surfaces, heavy laptops, light laptops, they just won't stop slipping. even tried to scratch the rubber around them to get traction. There are far better options, it's basically a doorstop that tried too hard. I chose to do this instead, https://smile.amazon.com/gp/product/B07ZK95JM9/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
Mount ONKRON G100 silver
39 Review
27" Monitor LG 27UL500, 3840x2160, 60Hz, IPS, black/white
23 Review
Wacom Ergo Stand for Cintiq Pro 24: Optimize Your Digital Creativity and Comfort
14 Review
π» GIKERSY Adjustable Height Laptop Stand - 1.5" to 20", Ergonomic Sit to Stand Laptop Riser for Desk - Compatible with MacBook Pro, Dell XPS, Lenovo, HP & More 10-17" Laptops
12 Review
16" Apple MacBook Pro 16 Late 2019 3072x1920, Intel Core i7 2.6 GHz, RAM 16 GB, DDR4, SSD 512 GB, AMD Radeon Pro 5300M, macOS, RU, MVVJ2RU/A, space gray
58 Review
Backpack XD DESIGN P705.571 black
32 Review
Backpack Xiaomi Mi City Backpack 2 dark gray
38 Review
Xiaomi Classic Business Backpack Blue Backpack
56 Review