Staples M by Staples Arc system letter-size white premium refill paper measuring 8 1/2" x 11" contains 50 reinforced narrow-ruled sheets for convenient writing. Staples M by Staples Arc system white premium refill paper features heavyweight paper and is ideal for letter-size papers. Arc system refill paper measures 8-1/2" x11" and contains 50 repositionable, strengthened, narrow-ruled sheets. 8-1/2" x 11". 50 repositionable reinforced sheets. Narrow sheets. Premium, heavyweight paper. Letter size. Staples Brand 100% Satisfaction Guaranteed.