Thickened Steel: All use international standard thickened steel, never deformation.
12inch-20inch children bicycle training wheel: Two back wheels form the triangle stable structure, no need parents no falling down more stable and secure.
Noiseless rubber wheel: Noiseless rubber wheel, more abrasion-proof, more noiseless safer. artistic and beautiful.
All use international standard thickened steel. never deformation which is thicker.
Auto-locking Nut: We use the autolocking nuts to insure kids safety. Safer than ordinary nuts, won't be loose after ******** on.
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