The Fast, Safe and Easy Way to Protect A/C Systems! With different refrigerants available for today's automotive A/C systems, the risk of cross-contamination has become a major concern. Tracerline® Tamper-Evident Straps and Sleeves are specifically designed to address this problem. These easy-to-use, cost-effective products ensure the purity of vehicle A/C systems, while protecting the integrity of your service equipment! Features: Tracerline TP-31 Tamper-Evident Straps come in a convenient zip-lock storage bag complete with 10 tamper-proof tie straps with unique serial numbers and matching labels. Warranties your work and protects A/C systems. Guards against unqualified repairs. Reduces comebacks. Safeguards your recovery equipment. Brings YOUR customers back to YOU!!