The flange inserts are made of silicone material, sturdy and useful, can be used for electric , wearable , simple and easy to replace, convenient to use. Safe and excellent, simple and convenient, sturdy and practical. Features -Color:White -Material:Silicone -Size:4.60X4.60X3.40cm/1.81X1.81X1.34in - Note: 13mm, 15mm, 17mm, 18mm, 19mm, 20mm, 21mm, 24mm. - Made of silicone material, flange inserts are safe and practical, sturdy and useful, serving for longer period. - Smooth surface, no rough burrs, flange inserts are excellent and sturdy, not hurting your , comfortable to use. - Fine texture, simple to replace, safe and useful, wearable flange inserts are practical and excellent. - Excellent performance, simple design, reasonable design, you can use flange inserts with confidence. - Suitable for wearable , electric , simple to use, bring much convenience to you. Package list: 1 x flange insert 24mm 1 x flange insert 21mm 1 x flange insert 20mm 1 x flange insert 19mm 1 x flange insert 18mm 1 x flange insert 17mm 1 x flange insert 15mm 1 x flange insert 13mm