Foam: compatible with microFET2 – screw on attachment
Foam: compatible with microFET3 – snap on attachment
Rubber: compatible with ergoFET – small screw supports measuring up to 300 lbs.
Rubber: compatible with ergoFET500 – large screw supports measuring up to 500 lbs.
Foam: compatible with ergoFET500- large screw supports measuring up to 500 lbs