Main feature:
1. Muaj kev nyab xeeb thiab txhim khu kev qha, kev sib tsoo thiab kev ua haujlwm siab;
2. Lub ntsiab pob khawm yog nruab nrog tus kheej lubricating bearings, uas muaj kev sib kis tau zoo thiab lub neej ntev, thiab yuav tsum tsis muaj lubrication thaum siv;
3. Lub interlocking equalization nrug deb ntawm cov cuab yeej tuaj yeem tswj tau qhov sib npaug ntawm qhov sib npaug ntawm cov vuas ntawm ob sab, kom tsis txhob muaj qhov tshwm sim uas cov nres nres ntawm ib sab ntab tawm tsam lub log tsheb vim qhov tsis sib xws;
4. Lub nres nres yog ib daim npav-hom kev molding qauv, uas yooj yim heev thiab ceev hloov. Nws yog nruab nrog semi-hlau (tsis yog-asbestos) nyuaj thiab semi-rigid, mos (xws li asbestos, non-asbestos) thiab lwm yam nres. Pads muaj rau cov neeg siv xaiv.
