Lot of 8 white machinable plastic cylinders. This is TECAFORM AH POM-C (Polyacetal Copolymer).
Height: 2.1875” (55.5mm)
Diameter: 3.45” (87.6mm)
Weight: 1.05 lbs (475g)
A single Delrin Acetal cylinder with a 3” diameter and 2” height from costs $23 from McMaster-Carr
I also have larger blocks available in other listings.
Contact me if you want to buy a smaller or larger quantities.