... no added plasticizers, coagulants, or fillers to migrate and contaminate the stream or cause tube hardening. Characters ... color, anti-aging, scratch-resistant, without scratches and very smooth 2. Expand to more 6 times ... can maintain memory after repeated bending and stretching 3. Strong strength and excellent elastic 4. Bright color ... .15mm,0.2mm , 0.25, 0.30mm,0.35mm, 0.40mm, 0.45mm, 0.50mm,0.55mm ...