VELCRO® Brand Stick On Squares are a quick and easy alternative to nails, tacks and glues. Perfect for DIY and craft projects, this pack contains 24 sets of black self-adhesive squares, which stick securely in minutes. Each one can hold up to 300g per 20mm x 20mm piece - just make sure that the surfaces are clean and dry before use. The adhesive on the back of each piece needs at least 10 minutes to set before use.