This is a replacement black palm support for the Matias Sculpted Ergonomic Rechargeable Keyboard for PC (but you can also use it to replace the palm support on the Matias Sculpted Ergonomic Rechargeable Keyboard for Mac if you prefer black to silver). It is made with natural rubber covered by fabric, and has magnets embedded inside, so just pull off your existing palm support and this one will magnetically snap into the place where the other one was. Note: If you have the Matias Sculpted Ergonomic Wired Keyboard for PC, then your palm support is glued on instead of magnetically attached, so you need the specific version of the palm support that is for the wired keyboard instead. Privacy Policy: matias.store/pages/privacyRoHS for European Residents: www.matias.ca/euProp 65 for California Residents: www.p65warnings.ca.govWarranty Terms and Conditions: matias.store/pages/warranty