A University of Colorado Boulder alum created what he says is the world’s first-ever 100% synthetic, biodegradable tennis string through his Boulder-based company Velociti.

Any tennis retailer can set up anyone’s racket with the same Babolat string that Alcaraz uses or the Tecnifibre string in Medvedev’s racket. That, however, would be pretty dumb.

George Tomkins, Master Racquet Technician, shows some Babolat RPM Blast tennis string for a photo at Canyon View Park on March 7, 2025. Larry Robinson / The Daily Sentinel.