Cole-Parmer 08435-0 18 Pound Solid Nylon Cable/Zip Ties, 4" L, Black; 100/Pk, These ties are injection-molded of 6/6 nylon— won’t corrode or stretch. Durable locking mechanism holds securely even when used to bundle vibrating or flexing materials.Ties continue to hold tension even in oily spray or wet environments.Easily apply ties by hand or use a tensioning tool—order tools separately.