Clover Needle Felting Tools. Needle felting is where fibers become interlaced, using a needle to punch through. Mat Large- A bristle brush-like mat that enables smooth punching with little resistance for punching applique. The mat is made to be use exclusively with the Clover Needle Felting Tool. It is available and sold separately. This brush-like mat has the ideal bristle length which provides the perfect hardness and density for punching. Approximately 4"x 6".