1-800-258-1302

or check the Delta Education website at
www.deltaeducation.com/buyfoss
 
For the FOSS replacement-parts catalog in PDF format, go to
http://www.deltaeducation.com/replacementpdfs
 
To shop for FOSS replacement parts online, go to
http://www.deltaeducation.com/how-to-order/replacement-parts-refills  

Delta Education is the exclusive distributor of the FOSS products. Delta works closely with the Lawrence Hall of Science in the manufacturing of the FOSS program to ensure all components meet the specifications of the FOSS developers.