ECG / EKG Medical Grade Recording Chart Paper, Z-Fold Pad, Red Grid, 216x280x218, Equivalent to Quinton 18416-002, Q4500, Q750B, Kendall 30729225, 5451587 Fits Quinton models Q4500, Q645, Q710, Q750 and Q-Stress (sold by the pad, 10 pads per case) Availability: Usually ships the same business day Quinton 18416-002 equivalent A111820$9.89 Copyright 2006-2011, A1cardiology.com