About FINDMAG 70 Pcs Flexible Magnets Round with AdhesiveQuantity: 70 PcsSize: 20mm diameter x 2mm thickGood Quality:We use high-quality magnetic materials and strong glue to ensure that the magnets is strong enough and better to use.Each disc can hold up to 60-90 grams. If you want stronger magnetic force, we recommend to use 2 or more magnetic dots. However, if you plan to hang anything large we suggest you purchase magnets with a stronger magnetic pull such as ceramic or neodymium magnetsMultipurpose:Magnets can be used for sticking practical information or good memories on the fridge, magnets are behind paper instead of on top: a clean and clutterless look. Can be used for DIY art projects, they can be used for vision boards, to make your own fridge magnets, to hold up little iron objects etc..Note:Please make sure that the surface to which you are applying the adhesive side is dry, clean, and adhesive-friendly. To obtain good adhesion starting with a clean surface is essential.The surface on which you plan to stick the magnet should be magnetically receptive. Please note, such surfaces as aluminum or copper are NOT magnetically receptive.After sticking to other things, wait a few hours before using it to make it stickier. The longer it is used, the stronger the stickiness.