A-Style probe design is the most versatile and has the most number of designs. 

A-Style probes were originally referred to as "acute" probes.  The word "acute" was misleading because A-Style probes can also be implanted chronically with appropriate probe packages.  Probe model numbers starting with 'a' are A-style probes.

By default, A-Style Probes are packaged in  A-Series Packages, which is appropriate for acute use with normal prep. A-Style Probes can also be combined other probe packages for more advanced and specialized applications.   

The primary difference between A-Style  and C-Style Probes is that C-Style Probes have an integrated flexible silicon ribbon cable (a 5um thin, narrow cable as pictured in the topper middle part of the photo). This  cable allows the C-Style Probes to be inserted into neural tissue and “float” with the brain, while a percutaneous connector can be mounted on a bone screw around the craniotomy.  The implantable portion of both A-Style and C-Style probes have the same feature spaces such as: geometric shape, thickness, and insulation material.

C-Style Probes are recommended for most chronic experiments.  Users with the following conditions might consider A-Style Probes with customized packages for chronic experiments:

• Chronic implants for small animal models (such as mice).
• Users who prefer not to handle silicon probes by hand.
• Procedures require the use of micromanipulator for implantation.
• Experiments require implants to be moved over the course of experiment.