BLX® fibers filter out extreme frequencies for the perfect feel. Amplifeel features customized foam and a softer buttcap for clean, enhanced feel. Spin Effect Technology provides potential for enormous spin. Clean, classic performance and feel that Pro Staff traditionalists love.11.1 Ounces (unstrung)/11.6 Ounces (strung). The item "Wilson Pro Staff 97 Countervail Black Tennis Racquet Grip Size 4 3/8" is in sale since Wednesday, April 25, 2018. This item is in the category "Sporting Goods\Tennis & Racquet Sports\Tennis\Racquets". The seller is "raquettedetennis" and is located in San Jose, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica.