What You Get: Includes 250 hooks and 250 loop dots (1 set = 1 loop and 1 hook, 250 sets in total) Diameter: 0.78 inches/20 mm (each dot sticker)Stronger Adhesion and Waterproof: The sticky dots are made of nylon material and hot melt adhesive, with high temperature resistance, very strong self-adhesiveness. Strong adhesion, long-lasting and durable, with anti-stick propertiesGreat for Classroom: These dots are a must-have in the classroom. I teach special education, so we are always creating task boxes, folders, and matching activities.Easy to Use: Easily tear off the paper roll when you need them for work, saving you time. Reusable, durable, and eco-friendly.Wide Application: These hook and loop dots can be attached to most things, especially for clean and smooth paper, plastic, glass, leather, metal surfaces, etc.