1) Blade Speed - generally faster blades tend to be used by the more aggressive players, and slower blades by the defensive players (uses more spin ), because they believe that a slower blade increases the amount of time the ball is in contact with the rubber, giving them more time to put spin on the ball. On the contrary, faster blades have less control, whereas the slower blades have more control.
2) Blade Stiffness - the stiffness of the blade refers to the amount of flex or bend the blade has. A stiffer blade will generally be faster but less spinny than a flexible blade. The different materials used in manufacturing blades will affect the stiffness of the blade; this includes adding in materials like carbon, aralyte, fibreglass etc.
3) Blade Layers - According to the Rules of Table Tennis, at least 85% of the blade by thickness must be natural wood so the 15% can include layers made of material such as carbon fibre, aralyte, or glass fibre. The effect of these materials can vary - carbon is said to strengthen and stiffen the blade, while also increasing the speed and the size of the sweet spot of the blade. Aralyte and glass fiber is meant to also increase the speed and size of the sweet spot, but is supposed to dampen vibration and give a softer feel than carbon. Generally the softer all-wooden blades will usually give the best feel, hence control, while composite blades will give you better speed and a larger sweet spot.
4) Blade Balance - the balance of a blade refers to whether the centre of gravity of the blade is closer to the handle or the tip of the head. Loopers and hitters tend to prefer head-heavy blades which help them generate that little bit of extra spin and speed, while blockers and defensive players quite often prefer blades with the centre of gravity towards the handle, which can increase the feeling of control. The blade balance can be changed by using heavier rubber to "move" the centre of gravity towards the head
5) Blade Weight - the weight of the blade itself can be a factor. Lighter blades can usually be swung more quickly, but heavier blades have more mass to use when hitting the ball, using lesser strength.
6) Blade Head Size - the difference in air resistance between large headed table tennis blades and smaller headed blades is pretty much insignificant, so the main issue of concern here is that larger rackets require more rubber to cover the surface, which makes the racket heavier and also tends to move the centre of gravity of the blade away from the handle. Example of these are the Japanese/Korean penhold blades witch has "squarish" head as compared with Chinese penhold and shakehand blades.



