Thanks to the soft touch material, these disposable ROUND Ergo D-Grips fit perfectly in the hand. Compatible with both the HAWK PEN and SOL NOVA machines. The cartridges can be changed quickly and easily as usual. By turning the grip, the needle position can be adjusted steplessly and easily. The tattoo grips are sterilized and individually packed so that covering the grip is not necessary - you simply screw the disposable grips over the sleeve.