E-Z ID Instrument Rings XL - Assorted Jewel 8 - 25/Pk. Just over 1/2" diameter to fit larger size handles. Colors in include: 2 of each: Plum and Midnight Blue and 1 of each: Grey, Teal, Copper, and Red. E-Z ID Rings are used to color-code your instrument set-ups by procedure. Assign each procedure a different color and place an ID ring of that color on each instrument that belongs in that set-up. This helps keep the correct instruments together and eliminates mixed-up and missing instruments.