Quick Measuring Guide for Ball-Trap Chastity Devices

Step 1 – Measure for Your Back Ring

1. While completely flaccid, loop the cord around the base of penis and behind scrotum.
2. Mark where the cord meets after fitting snugly (a pinky finger should barely slide under).
3. Leave on for 15–20 mins to check comfort: no color change or discomfort.
4. Remove and measure the loop length. Repeat three times per day and average.
5. Convert to diameter: Divide by 3.14 (π). Round to nearest ring size offered.
6. If between sizes, beginners should choose the larger ring.

Quick Alternative: Compress skin until 1–2 fingers fit, mark, measure, divide by 3.14.

Step 2 – Measure Cage Length

1. Fully flaccid, measure from pubic bone to tip (top side of penis).
2. Subtract ¼–½ inch for snug fit.
3. Select the closest cage length equal or shorter to this number.

Step 3 – Measure Internal Cage Diameter (Girth)

1. Wrap cord around the thickest point of the shaft, mark, then measure.
2. Repeat 3 times daily and average.
3. Convert to diameter: divide by 3.14.
4. Choose a cage bore close to or slightly larger than this value.

Step 4 – Estimate the Ball Gap

• High & Tight: Choose a wider gap for comfort.
• Low & Loose: A smaller gap adds security.

Long-term wear may relax scrotum tissue, allowing you to adjust gap size over time.

Measurement Record Table

Post-Fit Checks

• Circulation: No numbness, coldness, discoloration, or pain.
• Urination: Unrestricted; adjust fit if obstructed.
• Security vs. Comfort: Snug—not tight. Loose = pullout/chafing; tight = danger.
• Thermal Swings: Consider slightly larger/smaller rings for different weather.
• Experimentation: Try different ring shapes or sizes over time.