Modern day racquets and paddles are made from a high modulus graphite, which is used to keep the frame lightweight and stiff for increased head stability and performance. These graphites and/or carbon fibres allow for more aerodynamic shapes to be made which increases the speed in which the racquet/paddle can travel through the air.
Isometric is a square head frame design employed by Yonex, that involves equalizing the length of the main and cross strings in the string bed. This head shape promotes increased stability and creates a bigger sweet spot to enhance control.
Decreases air resistance and realizes a quicker swing.