The sweet spot is big and sits low, where you actually hit the ball. Most control, least power, most margin. Every first racket worth buying is round.
The sponge between the faces. A soft core sinks under the ball and soaks up a frame hit; a hard core sends the shock up the handle. It is the single biggest comfort decision on the sheet.
Quick to turn, easy at the net, kind to the elbow. A fine first choice.
The box says a range, like 360–375 g. The catalogue takes the middle of it and drops that into one of these three bands. Two rackets a few grams apart usually land in the same band — and score the same.
Where most adults should start. Enough mass to block a hard ball, light enough to swing for two hours.