Ideal for electronic and computer parts assembly, ESD tops protect delicate components from damaging static electricity. Static-dissipating laminate top and self-edges surround an industrial-grade 45-lb. density particleboard core. Surface resistivity is greater than 105109 ohms/sq. Includes a 10' grounding cord. Available in two sizes: square edged 1 1/4" thick top with 1 1/8" core and phenolic backer sheet on the bottom; and “comfort” edged 1 3/4" thick top with three-piece 1 3/4" thick core and backer sheet on the bottom. Ships unassembled.