Neodymium silicon magnet, 18 mm, pack of 10, assorted colours. Supplied = assembled. Diameter = 18 mm. Colour = assorted colours. Adhesive force = 0.8 kg. Shape = round. Material = neodymium, silicon. Thickness = 4 mm. Feature = magnetic. Product type = round magnets. High adhesive force at a low volume. Easy to grip, does not slip through the fingers when pulled off. Does not damage the surface, protects the magnetic core. With an all round silicon coating.