ECG / EKG Medical Grade Recording Chart Paper, Roll, Red Grid, 50x100, Medical Grade Recording Chart Paper Equivalent to: Philips - HP 4650-9677 (sold by the roll, 50 rolls per case) Availability: Usually ships the same business day Philips - HP 4650-9677 equivalent A18549I$1.02 Copyright 2006-2011, A1cardiology.com