



Everything you need, ready to install:
Stop playing with dead strings. Restore fresh-string feel in seconds — and save on restringing all season long.
1. CHOOSE YOUR VERSION - COUNT THE LOOPS AT YOUR RACKET'S BRIDGE
Flip your racket over and look at the curved bottom section (the bridge).
Count the string loops passing through it - you'll see either 3 or 4.
Select the matching version below. Not sure?
String tension starts dropping the moment your racket leaves
the stringing machine - and doesn't stop. Within weeks, that responsive, powerful feel you love has gone flat. You swing harder, your arm works more, your game suffers. The Retenser Standard solves this permanently.
Fitted to your racket's bridge by any stringer, the Retenser lets you add back up to 2 kg of tension - twice - using nothing
but the included key. Turn it. Feel the difference. Walk on court playing like you just came straight from the stringer.
Approved by the International Tennis Federation (ITF),
compatible with every string type, and reusable for as long as
you play. A one-time investment that pays for itself every
season.
Count the string loops at the curved bottom section of your racket (the bridge). Three loops = order the 3-cylinder version. Four loops = order the 2-cylinder version. Still unsure? Email us at info@retenser.com with a photo and we'll confirm in minutes.
Your stringer doesn't need any prior experience. Every box includes a QR code linking to a short installation video — they scan it, watch it, done. It adds minimal time to a standard restringing.
The Retenser fits almost every modern tennis racket. Each unit ships with two base parts — one flat and one rounded — to accommodate different bridge shapes. Works with all string types.
Around 5 grams — less than 2% of racket weight. It also replaces the existing grommet strip at the bridge, which partially offsets the addition. The Retenser sits exactly at the racket's centre point, so balance is minimally affected.
Yes. The Retenser is officially approved by the International Tennis Federation (ITF) and can be used in all professional and amateur competitions worldwide.