This instrument is used to force the inks through the screen and help achieve an even print. We use Urethane blades which are more durable and available in any durometer. We sell with either 50 (fabric - red) or 70 (paper - white) durometer blade hardness. We stock 5", 8", 10", 12", 15" and 18" but can custom make any size over 5". Custom sizes are billed at $3 per inch. Please order custom lengths here.