The DB688 QUIET MOUNT 1.20-1.80 are dubro's patented elastomeric mounts and reduce airframe vibration thereby reducing both noise, stress.
The mount uses 2 elastomeric ribbed dampers at each corner, the outer damper absorbs the initial engine torque loads, whilst the inner solid portion leaves plenty of compression to effectively absorb power impulses. Truly innovative.
Please Note :
The image shows the smaller motor mount 682 as an image for 688 was not available.