Qingdao Gofai Rubber supply various rubber feet / plastic feet for ladders. 
any size and color can be customized. 
Much more stocks for your reference too. 
For more, please contact with Ms.Kathy Zhao
Email: chinarubber@aliyun.com

Qingdao Gofai Rubber can provide you with high quality sound isolation clips A Sound Isolation Clip creates a high Sound Transmission Classification rating for your wall or ceiling assembly and offers an economical method to “float” your walls or ceilings. These isolation clips are used for vibration control of structure-borne noise and help build assemblies that will more effectively block airborne noise transmission. 
Email;chinarubber@aliyun.com 
SKYPE; rosebushy

The rubber dust cover is made by high quality silicone rubber. can be used to SFP. Color is black/white/red/blue,etc. Also accept customized size too. Besides the rubber dust for USB A, we have rubber caps and rubber plugs for RJ45, DP,DIV,SFP, RJ11,MICRO USB PORT,TYPE-C, RCA,HDMI.AUDIO-A,AUDIO-B,DB-9,VGA,RS232, IETS,SD-A,BNC,AV,EX1R,DDR123, SD-E,PCI,PCI-E,AGP,USB-B, MINI USB, ETS MICRO HDMI,SFP-B, MINI DISPLAY PORT,DB25,LPT,ESATA-A,FIREWIRE800(1394-9),ETC.

The rubber dust cover is made by high quality silicone rubber. can be used to SFP. Color is black/white/red/blue,etc. Also accept customized size too. Besides the rubber dust for USB A, we have rubber caps and rubber plugs for RJ45, DP,DIV,SFP, RJ11,MICRO USB PORT,TYPE-C, RCA,HDMI.AUDIO-A,AUDIO-B,DB-9,VGA,RS232, IETS,SD-A,BNC,AV,EX1R,DDR123, SD-E,PCI,PCI-E,AGP,USB-B, MINI USB, ETS MICRO HDMI,SFP-B, MINI DISPLAY PORT,DB25,LPT,ESATA-A,FIREWIRE800(1394-9),ETC.

Qingdao Gofai Rubber produce rubber blocks. Material is nature rubber/silicone rubber/EPDM/NBR/SBR,etc. Shape is round, square,rectangle or customized Color is Black or customized Certificate: ROHS,ISO Gofai Rubber also accept customzied size and shape too. If you are interested in it, please feel free to email to : chinarubber@aliyun.com

The rubber dust cover is made by high quality silicone rubber. can be used to SFP. Color is black/white/red/blue,etc. Also accept customized size too. Besides the rubber dust for USB A, we have rubber caps and rubber plugs for RJ45, DP,DIV,SFP, RJ11,MICRO USB PORT,TYPE-C, RCA,HDMI.AUDIO-A,AUDIO-B,DB-9,VGA,RS232, IETS,SD-A,BNC,AV,EX1R,DDR123, SD-E,PCI,PCI-E,AGP,USB-B, MINI USB, ETS MICRO HDMI,SFP-B, MINI DISPLAY PORT,DB25,LPT,ESATA-A,FIREWIRE800(1394-9),ETC.