Speed Pro Speed Pro Piston Forged 4.160" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 10.3 cc 1959995 And they've now come out

And they've now come out with their Next Gen practice tree that offers the user a variety of added features

The driver can select the transmission type through a slide switch located on the right side of the device

GMR45 or Waterproof GMR25

Quick Turn Tabs for 1" Spring Lightweight

but at a more economical price

Speed Pro Speed Pro Piston Forged 4.160" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 10.3 cc 1959995 And they've now come outFully updated skirt profiles Exclusive DUROSHIELD skirt coating. DUROSHIELD provides scuff resistance, reduced bore clearances and enhanced ring sealing. SPEED PRO POWERFORGED pistons are built to stringent specifications with a precision CNC machined dome and skirts and microfinished ring grooves. The manufacturing process ensures that piston weights within a boxed set will not vary more than 4 grams and that skirt sizes are matched to within 0.