The Ninety Post on a net post at sunset, sand running into the lower tube.
NINETY

Own yourninetyseconds.

A precision 90-second sand timer for the tennis changeover. Flip it when you sit, play when it runs out.

Changeover Ready
Lives outside all season Clamps to any post Made from recycled tennis cans Flip when you sit

Ninety seconds can turn a match around.

The tennis changeover can help a competitor redirect a match's trajectory. This simple sand clock allows players to make the most of every second.

No phone, no scoreboard clock across the court. Just sand you can see from the bench.

The gray Ninety Post on a net post at sunset, sand falling into the lower tube, while a player hits on the court behind it.
Ninety Post, Gray, on court at sunset.Sand you can read from the bench.

From the can,
to the post.

The clear tubes on every Ninety start life as recycled tennis-can plastic. Here's the journey, roughly.

Illustrative. Simplified steps, not a factory spec.

  1. 1

    Used can

    A finished can of balls. Normally, the end of the line.

  2. 2

    Cleaned

    Label off, washed until it's clear again.

  3. 3

    3D-printed funnel

    The center funnel is 3D-printed. Its opening is sized so the sand takes ninety seconds.

  4. 4

    Assembled

    Two clear tubes, a center funnel, pale sand, and a clamp.

  5. 5

    On the post

    Clamped to the net post, ready for every changeover.

Clamp. Flip. Play.

Clamp

A steel band clamp fixes it to any standard net post. No setup, and it stays put.

Close-up of the gray housing and its side arm, fixed to a black net post with a stainless-steel band clamp.

Flip

Players flip it the moment they sit: pull, twist 180°, push back. That's the whole interface.

A player's hand reaching to flip the Ninety Post on the net post.

Play

When the sand runs out, the changeover's over. Back to the baseline.

A player hits a forehand at sunset while the Ninety Post on the net post shows all its sand in the lower tube.

Lives on the post.
All season.

Built to live outdoors through a full season. No setup, no theft, no batteries. Clamp it once and forget it's there, until you sit down.

Go on, the stickers peel. Drag them around.

The Ninety Post in white clamped to a net post on a green hard court under a blue sky.Post, in white.
Ninety Post in white on a net post, seen head-on with the court behind.Ninety Post in gray on a net post, sand settled in the lower tube.

Ninety Post

$30.00

A 90-second sand clock for the tennis changeover. Clamps cleanly onto any standard net post. Players flip it the moment they sit. No setup, no theft, no batteries. Built to live outdoors through a full season.

Housing color: White
Quantity
Buy Ninety Post in White Secure checkout by Shopify.
Coming soon

Two ways to own your changeover. One stays on the court. One travels with you. The travel version isn't for sale yet.

Questions from the bench.

Anything else? Ask us on Instagram.

What exactly is Ninety Post?
A 90-second sand clock for the tennis changeover. It clamps onto the net post; you flip it when you sit and play when it runs out.
Is it really made from tennis cans?
Yes. The two clear tubes are recycled tennis-can plastic. The process illustrated above is simplified to show the idea, not a step-by-step factory spec.
Will it fit our net post?
It clamps cleanly onto any standard net post. A short side arm holds the clock, and a stainless-steel band clamp fixes the arm to the post.
Does it need batteries or charging?
No. It's sand and gravity. No setup, no batteries.
Can I leave it outside?
That's the idea. It's built to live outdoors on the post through a full season.
Which colors can I get?
The center housing comes in White or Gray. The price is $30.00 for either.
Is there one I can take with me?
A travel version is coming soon. For now, Ninety Post, the one that stays on the court, is the one for sale.

Flip it when you sit. Play when it runs out.

Own your ninety seconds, with a clock that used to be a can of balls.

Buy Ninety Post $30