304 Stainless Steel -- These stencils are made of high quality 304 stainless steel, the thickness of steel mesh is perfect. 27 PCS/Set, enough to meet your various needs. Not Easy To Deform -- They can be heated by the hot air machine, these stencils are not easy to deform when heated. Cooperate with ordinary air gun, the manual reballing can be carried out, no need to purchase another reballing platform. Specially Designed -- It is specially designed for laptop, desktop, communication main board north-south bridge, and graphics card, etc all kinds of BGA chips. It is easy and quickly for reballing the BGA IC, useful and economical accessories for BGA soldering.Specifications: Material: 304 stainless steel Color: as shown Stencils specifications: as the picture Quantity: 27 PCS/Set Weight: 60g Package Included: 27 x Universal Stencils Important tips: 1. Leaded solder ball melting point 183 degrees, alloy SN63PB37 (tin 63% lead 37%).2. Unleaded solder ball melting point 217 degrees Celsius. Alloy SN96.5 ag3cu0.5 (tin 96.5% silver 3% copper 0.5%). 3. Some good solder ball and silver is normal. Melting point is normal. 4.When heated directly with the air gun. Pay attention to adjusting air gun temperature. It doesn't need too high temperature. Otherwise, will result in the deformation of the stencils.