Penn QST 36 Foam Youth Tennis Balls
- Foam youth tennis ball for 36 foot courts
- USTA approved for the 10 and Under Tennis Program
- Higher density foam for a slower, controlled bounce
- Oversized diameter, red and yellow two tone felt
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A sensible first ball for young children learning on a short court, since it bounces low and moves slowly. Ball count and exact diameter are missing from the listing.
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ASIN: B00KLXJ8YUModel: QST 36 FoamCategory: Tennis Balls
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Overview
Higher density foam under a two tone felt cover slows this Penn youth ball down, so a beginner has more time to reach it. The oversized body is easier to see and hit, and the red and yellow pattern shows spin as it travels.
Slow, predictable bounces are what make the Penn foam ball useful for small kids still building hand eye coordination. It is made for short courts, so older juniors on a full court will find it too slow.
Who it's for
Made for kids starting out in a red ball program or at home on a mini court. Older players moving to faster balls will outgrow it quickly.
Pros and cons
- Low, slow bounce for beginners
- Larger size is easier to hit
- Two tone felt shows spin
- Approved for the youth program
- Ball count not listed
- Too slow for full court play
- Indoor or outdoor use not stated
Performance notes
Bounce height and speed are governed by the dense foam, which absorbs more energy than a pressurized ball. A larger diameter adds air drag, so the ball slows down in flight and gives a child more reaction time.
Specifications
| Brand | Penn |
|---|---|
| Model | QST 36 Foam |
| Ball Type | Foam, red stage |
| Color | Red and yellow two tone felt |
| Size | Oversized diameter |
| League Name | USTA 10 and Under Tennis Program |
| Recommended Uses For Product | 36 foot court |
Frequently asked questions
How big is the Penn QST 36 foam ball?
The listing calls it oversized but gives no diameter measurement.
What court size is the Penn QST 36 made for?
It is designed for play on a 36 foot court.
Is the Penn QST 36 a regular pressurized tennis ball?
No. It is a higher density foam ball with a felt design, built for controlled bounce and reduced speed.
Can the Penn QST 36 be used in junior programs?
Yes. It is approved by the USTA for the 10 and Under Tennis Program.