https://www.alibaba.com/product-detail/Lanchuang-137-75mm-Industrial-Heating-Element_1600306642245.html?spm=a2700.galleryofferlist.normal_offer.d_title.46fe4b7dSs7piR

custom : https://www.alibaba.com/product-detail/Electric-circular-infrared-ceramic-heater-band_1600162187765.html?spm=a2700.galleryofferlist.normal_offer.d_title.79b0341aHfC4v8

70 : https://www.alibaba.com/product-detail/high-temperature-ceramic-bands-heater-220V_1600641206508.html?spm=a2700.galleryofferlist.normal_offer.d_title.79b0341aHfC4v8