Laser & amp; Ilca. Create less friction between the bottom of the mast and the shell. Considerably Print the mast foot well of your standard laser, 4.7 and radial and Ilca - Teflon mast disc for laser & amp; They put it in the mast foot hole. Created less friction between the bottom of the mast and the shell. Considerably print the mast foot well of your laser. Dismeter diameter: 61 mm Dischrian thickness: 1 mm