4K gold stud long earrings are a beautiful and elegant accessory. They are typically made from 14 karat gold, which is a popular choice for jewelry due to its balance of durability and value. Here are a few features and styles you might find:

1. Design: Long stud earrings can vary in length and may feature various shapes such as bars, chains, or geometric designs. Some may have embellishments like diamonds or gemstones.

2. Occasions: These earrings are versatile and can be worn for both casual and formal occasions. They add a touch of sophistication to any outfit.

3. Comfort: Long studs are often lightweight and comfortable to wear, making them suitable for extended periods.

4. Care: To maintain their shine, it's essential to clean 14K gold jewelry regularly and store it properly to avoid scratches.