Stickle Bricks are a construction toy primarily intended for toddlers invented by Denys Fisher in 1969. The brand is owned by Hasbro and they are currently manufactured by Flair Leisure Products plc. An individual stickle brick is a colourful plastic shape a few centimeters long which has a "brush" of small plastic "fingers" on one or more edges. The fingers of adjacent stickle bricks can interlock, allowing them to be joined in various ways. Standard sets of stickle bricks contain triangular, square and rectangular pieces. Most sets also include other types of pieces such as heads, wheels and teddy bear shapes.
Several companies manufacture similar toys, not all of them compatible. Names for these toys include "Nopper", "Bristle Blocks", "Fun Bricks", "Clipo", "Krinkles" and "Thistle Blocks".