Strings

Expert Guide to ReString Zero and Toroline O-Toro

October 23, 2025 Juan

Both Zero and O-Toro are hexagonal polyester strings designed for spin. They share similar profiles and feature advanced coatings for better snapback and durability.

The key difference between these two strings comes down to power and feel. Zero delivers more power with a slightly stiffer feel, while O-Toro provides more control and a slightly softer feel.

This article breaks down the performance characteristics of both strings and helps you choose the right one for your game.

Performance Comparison Table

Feature	ReString Zero	Toroline O-Toro
Shape	6-sided polyester	6-sided polyester
Power	Engineered for power	Moderate power
Spin	Maximum spin	Maximum spin
Control	Moderate control	Good control
Feel	Slightly stiffer feel	Softer feel
Durability	Excellent tension maintenance	Great tension maintenance
Sustainability	ReString sustainability projects	N/A
Best For Players	Wanting maximum spin and power	Wanting maximum spin with control

ReString Zero Overview

Zero is engineered for maximum power and spin, helping aggressive players win matches.

It has a hexagonal shape with an ultra-slippery coating for easy string movement. This means your main and cross strings slide across each other with less friction, creating more spin.

Zero also has exceptional tension maintenance due to the string’s long lasting snapback coating. This helps you play better for longer and means you won’t have to restring as often.

The low-friction coating also resists notching better than traditional shaped strings. This durability factor contributes to Zero's longer playability compared to other polyesters.

Zero is sustainably packaged in FSC-certified recycled paper alongside our carbon-neutral operations. Our packaging uses 50% less material than standard industry packaging.

The string is available in 17G (1.23mm) and 16G (1.28mm) gauges to suit different player preferences and durability needs.

Toroline O-Toro Overview

O-Toro is also a hexagonal poly developed with input from Steve Johnson, an ex-top 25 ATP pro.

The string's spin comes from a combination of bite from the six-sided shape and snapback thanks to its modern coating.

O-Toro also has a slightly softer feel than many shaped polyesters and provides tension stability over multiple sessions.

The string is only available in 17G (1.23mm) gauge.

Which String Should You Choose?

Choose Zero if you want maximum spin and power with exceptional tension maintenance. Perfect for aggressive baseliners looking to play a big game from the back.

Choose O-Toro if you want maximum spin in a slightly softer and more controlled string. However, if spin and control are your priorities, consider Sync, a slick round polyester string.

About the Author: Juan is the co-founder of ReString. He was born in Argentina, raised in Japan, and moved to the US to pursue college tennis. He now plays as an ATP & WTA hitting partner.