Extreme-Temperature Slippery PTFE Ball, 3/4" Diameter 316 Stainless Steel Precision Ball, 3/4" Diameter Extreme-Temperature Slippery PTFE Ball, 1/8" Diameter

Extreme-Temperature Slippery PTFE Ball, 3/4" Diameter 316 Stainless Steel Precision Ball, 3/4" Diameter Extreme-Temperature Slippery PTFE Ball, 1/8" Diameter Hope that helps! I also tried the same stainless steel in 1/8", but that made the trackball loud.