Players are equipped with a racket composed by a wooden blade covered with rubber on one or two sides depending on the grip of the player. Recent years have seen an advancement in technology of table tennis blades. Materials of different properties may be combined with the wood in the blade to enhance its playing performance. Many blades today feature one or more carbon layers within them to enhance their 'sweet spot', and to give the player a greater margin of error when playing powerful shots. Materials incorporated into table tennis blades today include kevlar, titanium, arylate, aramid, and aluminium.