Red Tiger is three rings at $24.99 with no published IDs. Mammoth is one ring at $39.99 with store girth 4.5 to 7.75 in. Dragon is the textured dual ring. Spec table: /compare/.
The problem this search actually is
One SKU or the other.
What to buy
Red Tiger ($24.99). Three silicone rings. The store does not publish inner diameters.
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
Red Tiger
Three silicone rings. The store does not publish inner diameters.
4.6 from 15,000+ reviews
Free shipping over $50 • Discreet packaging • Ships from Huntington Beach, CA
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
Buying all three to invent a size chart.
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.