Sure-Check Strips - White 3.75' x .625' (10 x 2cm) 100/Bx. Class 4 indicator for use in pouches, tubing, autoclave bags, CSR wraps. Indicates all conditions for sterilization have been achieved - time, temperature and presence of steam. Meets OSHA & CDC guidelines for sterilization monitoring. Simple, convenient to use. Package of 100 strips