Haptic coin has a bearing groove in the middle. You can DIY. The feel of red copper is heavier, and long-term use will leave the patina of years. The material of titanium alloy is very light, very suitable for carrying. The weight of zirconium alloy is moderate, and the cost-effectiveness of stainless steel is the best.
Haptic Coin Matrix EDC Carbon Fiber $50.00 – $60.00
Haptic Coin Devil Milk Cover Stainless steel $160.00
Haptic Coin Screw Nut
$120.00 – $199.00
I really like this very industrial-style nut shape. The metal is cut and polished to create a sense of edges and corners.