The First stock Head Speed 25 3 7/8 Novak Djokovic Junior Tennis Racket is a tennis racket designed for junior players. Here are some details about this racket:

1. Size: The Head Speed 25 is specifically designed for junior players and has a length of 25 inches (63.5 cm). This length is suitable for kids aged 9-10 years or those with a height between 50-55 inches.

2. Weight: The racket weighs 230 grams (8.1 ounces), which makes it relatively lightweight. This weight is suitable for junior players who are transitioning from smaller, lighter rackets to slightly heavier ones.

3. Grip Size: The grip size of this racket is 3 7/8, which refers to the circumference of the handle. This size is suitable for players with smaller hands, typically in the junior age range.

4. String Pattern: The racket comes with a 16x19 string pattern. This refers to the number of main and cross strings on the racket's string bed. A 16x19 pattern provides a good balance of power and spin potential.

5. Novak Djokovic Edition: This racket is part of the Head Speed series, which is endorsed by professional tennis player Novak Djokovic. It features his signature logo and design elements.

6. Condition: The racket is described as "New," meaning it has not been used before and is in perfect condition.

It's important to note that while this information is accurate based on the given description, it's always a good idea to verify the details and specifications with the seller or retailer before making a purchase.