Measure erect girth. Mammoth: 4.5 to 7.75 in. Dragon: 4.0 to 6.75 in. Both figures are store copy.
The problem this search actually is
Girth, not length, is what the store charts use.
What to buy
Mammoth Ring ($39.99). A stretch silicone ring. Store lists 1.5 in oval inner size, 2.5x stretch, erect girth 4.5 to 7.75 in.
Mammoth Force
Mammoth Ring
Stretch silicone ring. Store lists oval inner size 1.5 in and a 2.5x stretch.
4.6 from 15,000+ reviews
Free shipping over $50 • Discreet packaging • Ships from Huntington Beach, CA
What not to buy
A length measurement used as girth.
If you are still comparing brands
The head-to-head pages live under vs . Alternatives to a named device live under alternatives . Measure before you order a ring: sizing guide .
Safety
The Mammoth, Dragon and Red Tiger product pages say thirty minutes maximum and never while sleeping. Remove at once on numbness, pain, coldness or a dark colour change.