1. working temperature: 260 degree or more 2. wear resisting 3. perfect mechanical properties 4. V-0 Flame retardant Item: PEEK large ringsMaterial: PEEK Virgin, PEEK 30CA, PEEK 30GF, HPV or PPS materialGrade: Virgin, A grade, made in Germany or US.Color: black, or naturalProcessing: machine or by moldTolerence: +/-0.5mmSizes: ODxIDxL=36x35x170/190,27x25x120,75x50x300,100x50x300,180x160x300, ...