Material: sturdy challenging metal. Replacement Bottom Case Screws Set. This set of screws contains ten screws that replace the screws of the bottom conceal of MacBook Pro Unibody 13" 15" 17". one hundred pc brand new and tremendous Replacement Bottom Case Screws Set. Compatible models: A1286 15 ":MacBook Pro Core 2 Duo 2.4 past due 2008 MacBook Pro Core 2 Duo 2.53 past due 2008 MacBook Pro Core 2 Duo 2.53 mid 2009 MacBook Pro Core 2 Duo 2.66 early 2009 MacBook Pro Core 2 Duo 2.66 mid 2009 MacBook Pro Core 2 Duo 2.8 past due 2008 MacBook Pro Core 2 Duo 2.8 mid 2009 MacBook Pro Core 2 Duo 2.93 early 2009 MacBook Pro Core 2 Duo 3.06 mid 2009 MacBook Pro Core i5 2.4 mid 2010 MacBook Pro Core i7 2.0 early 2011 MacBook Pro Core i7 2.2 early 2011 MacBook Pro Core i7 2.3 overdue 2011 ect A1278 thirteen ":MacBook Core 2 Duo 2.0 past due 2008 MacBook Core 2 Duo 2.4 late 2008 MacBook Pro Core 2 Duo 2.26 mid 2009 MacBook Pro Core 2 Duo 2.4 mid 2010 MacBook Pro Core 2 Duo 2.53 mid 2009 MacBook Pro Core 2 Duo 2.66 mid 2010 MacBook Pro Core i5 2.3 early 2011 MacBook Pro Core i5 2.4 overdue 2011 MacBook Pro Core i7 2.8 past due 2011 MacBook Pro Core i7 2.7 early 2011 A1297 17 ":MacBook Pro Core 2 Duo 2.66 early 2009 MacBook Pro Core 2 Duo 2.8 mid 2009 MacBook Pro Core 2 Duo 2.93 early 2009 MacBook Pro Core 2 Duo 3.06 mid 2009 MacBook Pro Core i5 2.53 early 2010 MacBook Pro Core i7 2.2 early 2011 MacBook Pro Core i7 2.3 early 2011 MacBook Pro Core i7 2.4 overdue 2011 MacBook Pro Core i7 2.5 past due 2011 MacBook Pro Core i7 2.66 early 2010 MacBook Pro Core i7 2.8 early 2010 Package Including:10 * Bottom Case Screws Note: Light shooting and diversified exhibits can cause the colour of the article within the picture a bit of diverse from the genuine thing. The size allowed error is +/- 1-3cm.