Tattoo Supply: 5/16

• 100 Red fiber coil core washers.
• 5/16 I.D. , 3/4 O.D. and 1/16 thick.

AND 

• 100 Black square Fiber coil core washers.
• 5/16 I.D. , 3/4 O.D. and 1/16 thick.
• 8mm I.D. , 19.38mm O.D. and 1.61mm thick.