The acoustic properties of titanium alloy have been increasingly recognized by the music market.
 
Nerdy tech stuff...
"The conduction velocity of sound wave is 6070 m/s in titanium alloy while in the synthetic materials is only 920 m/s. Therefore in the titanium alloy the sound speed is at least six times faster than it is in synthetic materials, so high-speed sound transmission will make the violoncello-body vibration more fully, significantly improved sound quality, better sound clarity, volume increases, rapid response, better sensitive and rich tone. These titanium endpins can fully meet the musicians to pursuit of better sound quality!"

STRADPET
Item: Titanium End Button and Lock Cylinder for Cello
Color: Ti-bright
Size: Diameters 24.5 - 25.5 mm
Rod Ø: 10mm Solid Core Titanium
 
This price includes free fitting in most situations. However, occasionally the Cello in pinhole needs to be adjusted and filled. Costs may be applicable.