E-Z ID Instrument Rings Large 1/4" - Neon Yellow. Package of 25 Rings. For color-coding instruments. Pre-packaged in a convenient dispenser. Latex-free. E-Z ID Ring System provides organized storage for rings until the next application. The system comes in a convenient dispenser that is pre-packaged and easy to use. E-Z ID Rings have smooth rounded edges and fit most hand instruments with a 1/4" diameter.