Big T Sizer – For Ultra Ceramic Payment Rings

🎯 30 Day Try Risk Free.

🚚 Free UK delivery. Ships in 1–2 working days.

✓ No battery

✓ No charging

✓ 30-day returns

✓ Works with supported banks.

🔒 Secure tokenised payments. No card details stored on your ring.

♻️ Delivered in sustainable packaging — soft pouch + recycled padded envelope. No unnecessary retail box.

We use standard US ring sizing.

Size 6 — 16.5mm inside diameter
Size 7 — 17.3mm
Size 8 — 18mm
Size 9 — 19mm
Size 10 — 19.8mm
Size 11 — 20.5mm
Size 12 — 21.4mm
Size 13 — 22.2mm

Not sure? Order our Big T Sizer first and receive a discount code for your final ring.

Tap to pay. No phone required.

Big T Sizer – Ultra Payment Rings

Find your perfect fit before ordering your Twinn Ultra Payment Rings.

This precision sizing tool allows you to test and confirm your exact ring size at home, ensuring a confident and comfortable fit before redeeming your wearable.

Why you’ll love it

• Accurate sizing for Twinn Ultra Payment Rings  
• Lightweight and easy to use  
• Helps avoid ordering the wrong size  
• Designed for quick, simple at-home testing  

How it works

1. Order the Big T Sizer for your chosen ring model  
2. We ship the sizing tool first  
3. Confirm your size at home  
4. Redeem your discount code and order your ring  

Important information

• UK shipping only for physical sizers  
• You will receive the sizing tool only – no ring included  
• Once your order is placed, you will receive a discount code to redeem your final ring  

Secure by design

Your final Twinn ring uses the same secure, tokenised payment technology as your bank. Card details are never stored on the wearable.

A deep blue accent adds contrast and character — designed to be seen, built to be trusted.