Here are some of the best rat tail combs for invisible locs:

• The Original Black Beauty Rat Tail Comb. This comb is made of high-quality plastic and has a tapered tip that makes it easy to get into the roots of your hair. It is also very durable and can withstand a lot of wear and tear.
• The Denman D3 Small Styling Comb. This comb is made of flexible nylon and has a variety of teeth sizes, which makes it ideal for detangling and styling hair of all textures. It is also very gentle on the hair, making it a good choice for people with sensitive scalps.
• The Tangle Teezer Original Detangling Comb. This comb is made of flexible teeth that are designed to gently detangle hair without pulling or breaking it. It is also very lightweight and easy to grip, making it a good choice for people with arthritis or other hand pain.
• The Goody Ouchless Rat Tail Comb. This comb has a rounded tip that prevents it from scratching the scalp, making it a good choice for people with sensitive scalps. It is also very affordable, making it a good value for the price.
• The Amika The Mane Tamer Detangling Comb. This comb has a unique design that helps to distribute hair evenly and prevent tangles. It is also made of heat-resistant materials, so it can be used on wet or dry hair.

When choosing a rat tail comb for invisible locs, it is important to consider the following factors:

• The size of the comb teeth: The size of the comb teeth will determine how well it can detangle your hair. If your hair is thick or coarse, you will need a comb with larger teeth. If your hair is fine or thin, you can use a comb with smaller teeth.
• The flexibility of the comb: The flexibility of the comb will determine how gentle it is on your hair. A flexible comb is less likely to pull or break your hair.
• The material of the comb: The material of the comb will affect how durable it is and how easy it is to clean. Plastic combs are the most affordable option, but they are not as durable as metal combs. Metal combs are more durable, but they can be more difficult to clean.
• The price: Rat tail combs can range in price from a few dollars to over $100. It is important to choose a comb that fits your budget.

I hope this helps!