From Evans:

For over 60 years, Evans has been an innovator in drumhead manufacturing and design. As the creator of the first synthetic drumhead and other revolutionary products such as EMAD, Hydraulics, and the UV1 series, Evans drumheads are designed with the intent of solving problems for drummers. Regarded for high quality and consistency all Evans drumheads are made in the USA and feature Level 360 Technology.

The UV1 series is designed for the widest range of sonic possibilities while remaining the most durable single-ply drumhead available. The patented UV-cured coating provides unmatched durability and consistency of texture, while the unique 10mil film delivers exceptional strength and versatility for a full range of musical applications. 

• Patented UV-cured coating provides unmatched durability and consistency
• Made from a single ply of unique 10mil film
• A single ply offers an open and expressive sound
• Extremely versatile for a wide variety of musical applications
• Level 360 Technology collar design ensures proper contact between drum head and drum shell
• All Evans drum heads are designed, engineered and manufactured in the USA