Since 1998 ECC LLC has been the leading manufacturer of hollow plastic balls. Our production is located in the USA, Wilmington North Carolina. The wide range of hollow plastic balls are used for drinking water, waste water, chemical, medical industrial military and commercial airport applications. ECC Bird Balls are used as covers and gas scrubbers. If you would like pricing and calculations of savings you can expect once you add the ECC Ball Covers please send email to Sales@eccllc.us or call 910-799-4411 ;case studies outlining these applications and their benefits including references will be emailed to you per your request including calculations on how ECC LLC will save you money.