Wilson Jones 3 Ring Binder, 1.5 Inch Round Ring, 4 Pack, Black (W70368-34NBPP) 4 pack of basic 3 ring binder has a 1.5 inch round rings that hold up to 330 sheets; durable polypropylene material lasts longer and is more durable than vinyl Chipboard is 100% recycled with 75% post consumer waste; two opaque interior pockets hold loose sheets Traditional round rings with top and bottom open and close triggers